Legend (OHELP/Layers)

GEN_00_Lithology (0) Unknown batholith rocks intrusive rocks invasive extrusive rocks marine sedimentary rocks marine volcanic rocks melange rocks metamorphic rocks sediments terrestrial sedimentary rocks vent and pyroclastic rocks volcanic rocks volcaniclastic rocks GEN_01_NEHRP (1) B C D E F GEN_02_Statewide_L_Tsunami_Inundation_M90 (2) GEN_03_Deposits (3) Unknown Historic(<150yrs) Pre-Historic (>150yrs) GEN_04_TypesOfDeposits (4) Unknown Complex Fall Flow Slide GEN_05_DEM (5) High : 3423.37 - Low : -11.3219 GEN_06_Slope (6) High : 87.7368 - Low : 0 GEN_07_Faults (7) <1,600,000, Inferred <1,600,000, Moderately constrained <1,600,000, Well constrained <130,000, Inferred <130,000, Moderately constrained <130,000, Well constrained <15,000, Inferred <15,000, Moderately constrained <15,000, Well constrained <150, Inferred <150, Moderately constrained <150, Well constrained <750,000, Inferred <750,000, Moderately constrained <750,000, Well constrained Class B, Inferred Class B, Moderately constrained Class B, Well constrained GEN_08_QuaternaryFaults (8) GEN_09_Geology_gen (9) Unknown Abbott Butte formation Actinolite schist Active dunes Aeolian sand Air-fall tuff Albite granite Alkali Canyon Formation Alkali-rich basalts and basaltic trachyandesites Alkaline Mafic Rocks Alluvial Deposits Alluvial and alluvial fan gravel of Milton-Freewater Alluvial and collvuial deposits Alluvial and lacustrine sediments of Shukash and Lapine basins of Couch and Foote (1985) Alluvial bottom lands Alluvial deposits Alluvial fan Alluvial fan and talus deposits Alluvial fan deposits Alluvial fan deposits, undivided Alluvial fan gravel Alluvial fan sand Alluvial fans, mostly rhyolite and basalt talus Alluvial fill Alluvial material Alluvial sediments Alluvial terrace gravel Alluvial-fan deposits Alluvium Alluvium and Holocene sedimentary deposits, undifferentiated Alluvium and beach deposits Alluvium and colluvium Alluvium and flanglomerate Alluvium and glacial deposits Alluvium and glacial deposits, undivided Alluvium and lower terrace deposits Alluvium and surficial aeolian deposits Alluvium of Columbia River floodplain and channel Alluvium of ancestral Sandy River Alluvium of smaller streams Alluvium on terraces Alluvium undivided Alluvium, colluvium, and talus deposits, undifferentiated Alluvium, glacial deposits and tephra Alluvium, undifferentiated Alluvium, undivided Alluvium-unconsolidated fluvial silt, sands and gravels Alpine-type intrusion Alsea Formation Alsea Formation, Sandstone Altered andesite Altered gabbro Altered intrusive rocks Altered tuff-bright red and white claystone Alvord Creek Formation Amphibole Schist Amphibole gneiss Amphibolite Amphibolite and metamorphosed intrusive rocks Amphibolite, metagabbro, and metadiorite Amygdaloidal andesite Andecitic and dacitic tuffs, tuff breccias and agglomerates Andes. brecc. Andesite Andesite and basalt Andesite and basalt debris flow Andesite and basalt flows Andesite and basaltic andesite Andesite and basaltic andesite sills, dikes, piston, and irregular intrusions, probably Clarno age Andesite and dacite Andesite and dacite flows Andesite and dacite intrusion Andesite and dacite lava Andesite and dacite lavas Andesite and dacite of First Creek Andesite and dacite of the Blue River Andesite and quartz latite flows Andesite below Rim Village Andesite breccia Andesite breccia dikes of Dick Creek Andesite dike Andesite dikes and sills Andesite dikes, plugs, and sills Andesite east of Munson Valley Andesite east of Wineglass Andesite flow Andesite flow-includes two flows locally interfingered with a white tuffaceous shale Andesite flows Andesite flows and domes Andesite flows, breccias, and sedimentary rocks Andesite north of Castle Creek, eroded cinder cone Andesite north of Castle Creek, lava flows Andesite northeast of Annie Falls Andesite of Applegate Peak, dikes Andesite of Applegate Peak, lava Andesite of Arant Point, intrusive core Andesite of Arant Point, lava Andesite of Arant Point, vitric andesite carapace Andesite of Badger Butte Andesite of Bear Lake Andesite of Bear Point Andesite of Boulder Lake Andesite of Brown Mountain Andesite of Cabin Creek Andesite of Castle Rock Andesite of Chicken Hill Andesite of Cloudcap Bay Andesite of Coyote Lake Andesite of Crater Peak, cinder cone Andesite of Crater Peak, lava flows Andesite of Devils Backbone Andesite of Duck Creek Andesite of Duck Creek Spring Andesite of East Fork Andesite of East Jefferson Park Andesite of East Park Ridge Andesite of Enola Hill Andesite of Fifteenmile Creek Andesite of Fish Lake Andesite of Fivemile Butte Andesite of Flounce Rock Andesite of Four In One Cone Andesite of Frissell Point Andesite of Garfield Peak Andesite of Gibson Lake Andesite of Goat Peak Andesite of Grotto Cove Andesite of Hancock Canyon Andesite of Harvey Lake Andesite of Hill 5721 Andesite of Hillman Peak Andesite of Hiyu Mountains Andesite of Hogg Rock and Hayrick Butte Andesite of Hole-in-the-Wall Park Andesite of Horse Mountain Andesite of Horseshoe Ridge Andesite of Hunts Creek Andesite of Ichabod Spring Andesite of Jefferson Creek Trail Andesite of Johnson Creek Andesite of Jordan Butte Andesite of Junction Lake Andesite of Kerr Notch Andesite of Knighten Creek Andesite of Kuckup Park Andesite of Laurance Lake Andesite of Lightning Spring Andesite of Little Badger Creek Andesite of Llao Bay, lower unit Andesite of Llao Bay, upper unit Andesite of Lolo Pass Andesite of McCubbins Gulch Andesite of McKinney Butte Andesite of McLeod Andesite of Merriam Cone, andesite breccia Andesite of Merriam Cone, andesite lava Andesite of Merriam Point Andesite of Middle Sister Andesite of Middle Table Andesite of Mildred Lake Andesite of Milk Creek Andesite of Mount Hood Andesite of Mount Jefferson Andesite of N. Fk. Breitenbush Riv. Bench Andesite of N. Fk. Breitenbush Riv. Canyon Andesite of Nohorn Creek Andesite of North Fork Breitenbush River Andesite of North Grizzly Peak Andesite of North Sentinel Hills Andesite of North Table Andesite of Old Baldy East Andesite of Palomino Creek Andesite of Pamelia Lake Road Andesite of Park Butte Andesite of Perry Lake Andesite of Phantom Cone, intrusions Andesite of Phantom Cone, lava flows Andesite of Pine Creek Andesite of Pumice Point Andesite of Pyramid Lake Andesite of Rainbow Creek Andesite of Riverside Andesite of Roundtop Andesite of Russell Saddle Andesite of Salmon Butte Andesite of Sawtooth Crater Andesite of Shale Lake Andesite of Shitike Creek Andesite of Skyline Road Andesite of Skyline Trail Andesite of South Fork Andesite of South Fork Breitenbush River Andesite of South Ridge Andesite of South Sentinel Hills Andesite of South Sister Andesite of South Table Andesite of Southeast Flank Andesite of Spinning Lake Andesite of Steel Bay Andesite of Sun Creek Andesite of Table Lake Andesite of Table Rock Andesite of Table Rocks Andesite of Tamarack Mountain Andesite of Tom Dick and Harry Mountain Andesite of Tumble Creek Andesite of Twin Knobs Andesite of Walker Creek Andesite of Wapinitia Pass Andesite of Warm Springs Boundary Andesite of West Face Cliffs Andesite of Whiteface Peak Andesite of Whitewater Creek Andesite of Whitewater Creek Falls Andesite of Whitewater Glacier Andesite of Whitewater River Headwall Andesite of Wizard Island, andesite breccia Andesite of Wizard Island, andesite pillowed flows Andesite of Wizard Island, lava flows Andesite of Woodpecker Ridge Andesite of Zigzag Mountain Andesite of east flank Andesite of middle and late Miocene age Andesite of section twenty Andesite of summit Andesite of the Boat Landing Andesite of the Diamond Lake shield Andesite of the Gaging Station Andesite of the Heppsie Formation Andesite of the Western Cascades Andesite of the central platform, andesite breccia Andesite of the central platform, andesite lava Andesite of the east basin Andesite of the west wall Andesite or Dacite Dikes Andesite plugs, dikes, and sills Andesite porphyry Andesite porphyry flows and agglutinate Andesite south of Bear Bluff, andesite capping lava Andesite south of Bear Bluff, oxidized cinders and bombs Andesite south of Bear Bluff, palagonitic tuff Andesite south of Mount Scott Andesite south of The Watchman Andesite vent deposits Andesite vent(?) of East Jefferson Park Andesite vitrophyre Andesite west of Burn Butte Andesite west of Clear Lake Andesite west of Fumarole Bay Andesite west of Pumice Point Andesite west of Red Cone Andesite west of Sand Creek Andesite, basalt, gabbro, and norite; plugs and dikes Andesite, porphyritic feeder dikes of the lower member Andesites Andesites of Walker Creek Andesitic and basaltic rocks Andesitic dikes and plugs Andesitic dikes and small plugs Andesitic flow Andesitic flow and flow breccia Andesitic flow, lower flow Andesitic flow, upper flow Andesitic flows Andesitic flows and flow breccia Andesitic formations Andesitic intrusive rocks Andesitic intrusives Andesitic lavas of Moss Mountain Andesitic lavas of Moss Mountain, flows Andesitic lavas, pyroclastics and sediments Andesitic laves of Moss Mountain, vents and plugs Andesitic plug Andesitic rocks Andesitic tuff Andesitic vent complex of unit Tma Andesitic vent deposits Andesitic volcanic and volcaniclastic rocks and conglomerate Andesitic waterworked tuffs and agglomerates Andesitic waterworked tuffs and agglomerates, shale and mudstone Andestie of Jude Lake Angora Peak member Aphanitic olivine andesite Aphanitic olivine basalt Aphyr. andes. Aphyric basalt Aphyric basaltic andesite Aphyric basaltic andesite lavas Aphyric dacite lava Aphyric high-silica rhyolite Aphyric rhyolite Aplite Applegate Group, metasedimentary rocks Applegate Group, metavolcanic rock of basaltic composition Applegate Group, mylonite Arago Peak marine terrace Argillite and chert Argillite, shale, cherty argillite (Elkhorn Ridge) Artificial Fill Artificial fill Ash flow of Bond Creek Ash flow tuff Ash flow tuffs Ash flow tuffs and tuffaceous sedimentary rocks Ash flow tuffs in the Madras Formation Ash of Diamond Craters Ash, sand, and loess Ash-flow Tuff of Oregon Canyon Ash-flow and air-fall tuff Ash-flow and pumice-fall deposits Ash-flow deposits Ash-flow tuff Ash-flow tuff and sedimentary rocks Ash-flow tuff of the lower east flank Ash-rich tuff Ashdown tuff Ashflow tuff Astoria Formation Astoria Formation, Cannon Beach member Astoria Formation, Wickiup Mountain member Astoria Formation, Wickiup Mountain member, upper part Astoria Formation, Youngs Bay member Augen gneiss Bald Mountain Batholith Bald Peter lava flow Basal ash-flow tuff Basal vitrophyre Basalt Basalt Sills Basalt and (or) basaltic andesite flow Basalt and Andesite Basalt and andesite Basalt and andesite cinder Basalt and andesite flows Basalt and andesite of Coburg Hills Basalt and andesitic basalt Basalt and basaltic andesite Basalt and basaltic andesite dikes, plugs, and sills Basalt and basaltic andesite flows Basalt and basaltic andesite flows and flow breccias Basalt and basaltic andesite intrusions of John Day age Basalt and basaltic andesite of Bear Flat Basalt and basaltic andesite of Belknap Crater Basalt and basaltic andesite of Columbia River Group Basalt and basaltic andesite of Mount Bruno Basalt and basaltic andesite of the Blue River Basalt and basaltic cinders Basalt and gabbro dikes and small intrusives Basalt and sedimentary rocks of Three Rivers Basalt and sediments Basalt and tuffaceous sedimentary rocks Basalt andesite Basalt boulder and gravel deposits Basalt breccia member of Cascade Head Basalt colluvium Basalt dikes Basalt dikes and sills Basalt dikes, sills, piston, and irregular intrusions Basalt flow Basalt flow and unconsolidated sedmentary deposits Basalt flows Basalt flows - probably correlate with Picture Gorge Basalt Basalt flows and intrusives Basalt flows and pyroclastics Basalt flows and volcaniclastic sedimentary rocks Basalt flows of Columiba River Group, may include flows of both Picture Gorge and Yakima Basalts Basalt flows, mainly derived from Keyes Mtn.: generally intracanyon to Tcf2 Basalt flows, reversed Basalt flows, unnamed Basalt in shale Basalt in valleys Basalt intrusions Basalt intrusives Basalt lava flow of Lava Lake Basalt near Alfalfa Basalt near Ghost Creek Basalt north of Castle Creek Basalt northwest of Whitehorse Butte, diabase plug Basalt northwest of Whitehorse Butte, lava flows Basalt of Awbrey Butte Basalt of Badlands Basalt of Barren Valley Basalt of Basin and Range, unit 1 Basalt of Basin and Range, unit 2 Basalt of Basin and Range, unit 3 Basalt of Battle Ax Basalt of Black Butte Basalt of Black Rim Basalt of Blue Canyon Lake Basalt of Booth Hill Basalt of Booth Lake Basalt of Borges Road Basalt of Brown Mountain Basalt of Brush Mountain Basalt of Buck Lake Basalt of Buck Peak Basalt of Bull Run Watershed and other ridge capping basalt Basalt of Burnt Top Basalt of Burton Butte Basalt of Camp Creek Ridge Basalt of Cannery Hill Basalt of Carver Basalt of Cascade Head Basalt of Castle Point, cinders Basalt of Castle Point, lava Basalt of Cave Creek Basalt of Cayuse Crater Basalt of Chicken Hills Basalt of Cline Falls Basalt of Close Butte Basalt of Coleman Rim Basalt of Columbia River Group Basalt of Condon Butte Basalt of Cord Basalt of County Line Basalt of Cox Butte Basalt of Craig Lake Basalt of Crutcher Bench Basalt of Cupola Rock Basalt of Daley Prairie Basalt of Diamond Craters Basalt of Dodge Basalt of Dogwood Spring Basalt of Dry River Basalt of Duck Creek Flat Basalt of Duck Pond Ridge Basalt of Eden Basalt of Eden and tuffaceous sedimentary deposits Basalt of Egan cone Basalt of Ferguson Spring Basalt of Foley Ridge Basalt of Frissell Creek Basalt of Frissell Point Basalt of Garrison Butte Basalt of Gingko Basalt of Ginkgo Basalt of Ginko Basalt of Grizzly Mountain Basalt of Grouse Butte Basalt of Hancock Canyon Basalt of Hardscrabble Basalt of Harney Lake Basalt of Hembre Ridge Basalt of Hembre Ridge, basaltic sandstone Basalt of Henkle Butte Basalt of Herman Creek Basalt of High Prairie Basalt of Hog Wallow Basalt of Horse Creek Basalt of Iron Mountain Basalt of Jenne Basalt of Johnson Prairie Basalt of Juniper Flat Basalt of Juniper Gulch Basalt of Kaiser Road Basalt of Katsuk and Talapus Buttes Basalt of Keno Basalt of Knot Tableland Basalt of Koosah Mountain Basalt of Lenz Butte Basalt of Little Brother Basalt of Little Catherine Creek Basalt of Long Butte Basalt of Long Prairie Basalt of Lookingglass Basalt of Lost Creek Basalt of Lost Lake Butte Basalt of Lost Lake chain of cones Basalt of Lower Desert (Lower Desert basalt member of Smith, 1986) Basalt of Lyons Ferry Basalt of Malheur Gorge Basalt of McCoy Canyon Basalt of Mohawk Basalt of Monon Lake Basalt of Moon Prairie Basalt of Mosquito Creek Basalt of Mount Defiance Basalt of Mount Scott Basalt of Mt. Pisgah Basalt of Mt. Talbert Basalt of Mud Spring Mountain Basalt of Newberry volcano Basalt of Olson Mountain Basalt of Opal Springs Basalt of Ortley Basalt of Outlook Basalt of Palouse Falls Basalt of Penny Spring Basalt of Pinehurst Basalt of Plainview Basalt of Pole Bridge Creek Basalt of Pothole Creek Basalt of Powatka Basalt of Powatka and Frenchman Springs member, undivided Basalt of Powatka, Frenchman Springs member and basalt of Dodge, undivided Basalt of Powder River Basalt of Powell Butte Basalt of Red Crater Basalt of Redmond Basalt of Robinette Mountain Basalt of Robinson Butte Basalt of Rodlun Road Basalt of Roney Creek Basalt of Round Lake Basalt of Rye Flat Basalt of Sand Hollow Basalt of Sand Mountain chain of cones Basalt of Sand Ridge, cinders Basalt of Sand Ridge, lava Basalt of Santiam Pass Basalt of Scott Creek Basalt of Sentinal Gap Basalt of Sentinel Gap Basalt of Sheepy Creek Basalt of Sherwood Butte Basalt of Silver Falls Basalt of Sims Butte Basalt of Smith Prairie Basalt of Spencer Creek (4728T) Basalt of Stockade Creek Basalt of Tetherow Butte (Tetherow Butte member of Smith, 1986) Basalt of The Island Basalt of Tipsoo Butte Basalt of Toketee Basalt of Tom Reservoir Basalt of Tong Road Basalt of Tunnel Creek Basalt of Twelvemile Table Basalt of Two Butte Basalt of Umatilla Basalt of Wapshilla Ridge Basalt of Waverly Heights and associated undifferentiated sedimentary rocks Basalt of Willow Creek Basalt of Winston Road Basalt of Winter Water Basalt of Wizard Falls Basalt of Woodpecker Lake Basalt of Wuksi Butte Basalt of Zion Hill Basalt of cones at summit and southeast flank of Cache Mountain Basalt of inaccessible cone Basalt of the Columbia River Group Basalt of the Klamath Rim Basalt of the Power Plant Basalt of the Western Cascades Basalt or Basaltic Andesite Dikes Basalt porphyry dikes & sills Basalt porphyry of the Hood River Valley Basalt sill Basalt southwest of Crowley Basalt to andesite of Hayden Creek Basalt to andesite of Jenny Creek Basalt west of Sun Creek Basalt(?), basaltic andesite(?), and andesite(?) Basalt, andesite, dacite, and basanite intrusions Basalt, andesite, tuff and rhyolite Basalt, basaltic andesite and andesite, unit 1 Basalt, basaltic andesite and andesite, unit 2 Basalt, basaltic andesite and andesite, unit 3 Basalt, basaltic andesite and andesite, unit 4 Basalt, basaltic andesite, and andesite Basalt, basaltic andesite, and andesite flows Basalt, basaltic andesite, and andesite intrusions Basalt, basaltic andesite, and andesite lava flows Basalt, basaltic andesite, and tuff Basalt, undifferentiated Basalt, undivided Basalt-Strawberry Volcanics Basalt-cobble conglomerate Basaltic intrusive rocks Basaltic Andes. Basaltic Intrusive Rocks, Undivided Basaltic Tuff Basaltic and andesitic ejecta Basaltic and andesitic flows Basaltic and andesitic flows and interbedded clastic rocks, basalt flows Basaltic and andesitic flows and interbedded clastic rocks, tuffaceous sandstone and siltstone, ash Basaltic and andesitic flows interbedded clastic rocks, basaltic, andesitic flows, sandstone, siltso Basaltic and andesitic submarine flows Basaltic andes. Basaltic andes., undiff. Basaltic andesite Basaltic andesite and andesite Basaltic andesite and andesite cinder and scoria Basaltic andesite and andesite intrusive rocks Basaltic andesite and andesite of Collier Cone Basaltic andesite and basalt Basaltic andesite and basalt flows of the Cascade Range Basaltic andesite and basalt flows, unnamed Basaltic andesite and basalt of Collawash Mountain Basaltic andesite and tuffaceous sedimentary rocks Basaltic andesite dike Basaltic andesite east of Annie Falls Basaltic andesite flow Basaltic andesite flows Basaltic andesite intrusions Basaltic andesite intrusive rocks Basaltic andesite lapilli tuff Basaltic andesite lava Basaltic andesite near East Lake Resort Basaltic andesite north of Crater Creek Basaltic andesite north of Crater Peak Basaltic andesite north of Little Castle Creek Basaltic andesite northwest of Little Castle Creek Basaltic andesite northwest of Pumice Flat, cinders Basaltic andesite northwest of Pumice Flat, lava flows Basaltic andesite northwest of Pumice Flat, plugs and dikes Basaltic andesite northwest of Williams Crater, cinder cone remnant Basaltic andesite northwest of Williams Crater, lava flow Basaltic andesite of Abbot Butte Trail Basaltic andesite of Aschoff Buttes Basaltic andesite of Aspen Butte Basaltic andesite of Bald Peter Basaltic andesite of Barnes Road Basaltic andesite of Bear Butte Basaltic andesite of Bear Lake Basaltic andesite of Bear Point Basaltic andesite of Beaver Dam Creek Basaltic andesite of Bert Creek, lava flows Basaltic andesite of Bert Creek, mudflow deposit Basaltic andesite of Biddle Pass Basaltic andesite of Bieberstadt Butte Basaltic andesite of Bingham Ridge Basaltic andesite of Black Crater Basaltic andesite of Black Pine Spring Basaltic andesite of Blue Ridge Basaltic andesite of Bluegrass Butte Basaltic andesite of Bonny Slope Basaltic andesite of Brokendown Waterhole Basaltic andesite of Broughton Bluff Basaltic andesite of Brush Creek Trail Basaltic andesite of Buck Mountain Basaltic andesite of Camp Creek Basaltic andesite of Carl Lake Basaltic andesite of Cascade Viewpoint Basaltic andesite of Castle Point Basaltic andesite of Chase Mountain Basaltic andesite of Cloud Cap Basaltic andesite of Clover Butte Basaltic andesite of Code Spring Basaltic andesite of Devil Canyon Basaltic andesite of Dog River Basaltic andesite of Dry Creek Basaltic andesite of East Jefferson Park Basaltic andesite of East Park Ridge Basaltic andesite of Elk Point Basaltic andesite of Eugene Creek Basaltic andesite of Fivemile Butte Basaltic andesite of Flapper Springs Basaltic andesite of Forked Butte Basaltic andesite of Fourmile Butte Basaltic andesite of Freye Lake Basaltic andesite of Graham Butte Basaltic andesite of Grasshopper Point Basaltic andesite of Grizzly Creek Basaltic andesite of Grizzly Peak Basaltic andesite of Hamaker Mountain Basaltic andesite of Hanks Lake Basaltic andesite of Happy Ridge Basaltic andesite of Hayden Mountain Basaltic andesite of Head Lake Basaltic andesite of High Knob Basaltic andesite of Hilda Lake - lower Basaltic andesite of Hilda Lake - upper Basaltic andesite of Hill 5415 Basaltic andesite of Hillman Peak, fall deposits Basaltic andesite of Hillman Peak, intrusions Basaltic andesite of Hillman Peak, lava flows Basaltic andesite of Hoodoo Butte Basaltic andesite of Hunts Creek Basaltic andesite of Jefferson Creek Basaltic andesite of Jefferson Lake Basaltic andesite of Jefferson Lake Trail Basaltic andesite of Kent Peak Basaltic andesite of Knox Butte Basaltic andesite of Laidlaw Butte Basaltic andesite of Lake Creek, basaltic andesite Basaltic andesite of Lake Creek, basaltic andesite vent deposits Basaltic andesite of Lake Creek, flow unit 1 Basaltic andesite of Lake Creek, flow unit 2 Basaltic andesite of Lake Creek, flow unit 3 Basaltic andesite of Lake Creek, flow unit 4 Basaltic andesite of Lake Creek, flow unit 5 Basaltic andesite of Lake Creek, flow unit 6 Basaltic andesite of Lake Creek, tuff Basaltic andesite of Le Conte Crater Basaltic andesite of Little Belknap Basaltic andesite of Little Butte Creek Basaltic andesite of Little Chinquapin Mt. Basaltic andesite of Little Nash Crater Basaltic andesite of Little Squaw Back Basaltic andesite of Lost Lake Butte Basaltic andesite of Mack Hall Creek Basaltic andesite of Maklaks Crater, cinders Basaltic andesite of Maklaks Crater, lava Basaltic andesite of Maxwell Butte Basaltic andesite of Meyers Hill, flow unit 1 Basaltic andesite of Meyers Hill, flow unit 2 Basaltic andesite of Meyers Hill, flow unit 3 Basaltic andesite of Middle Sister Basaltic andesite of Milk Creek Basaltic andesite of Millican Crater Basaltic andesite of Mirror Lake and Eureka Peak Basaltic andesite of Mist Creek Basaltic andesite of Monon Lake Basaltic andesite of Mount Bachelor Basaltic andesite of Mount Washington Basaltic andesite of Mt. McLoughlin Basaltic andesite of Mule Hill Basaltic andesite of N. Fk. breitenbush Riv. Bench Basaltic andesite of Nash Crater Basaltic andesite of North Cinder Peak Basaltic andesite of North Fork Breitenbush River Basaltic andesite of North Grizzly Peak Basaltic andesite of North Ruddy Hill Basaltic andesite of North Sister Basaltic andesite of Oasis Butte, lava Basaltic andesite of Odin Falls Basaltic andesite of Olallie Butte Basaltic andesite of Old Baldy Basaltic andesite of Papoose Lake Basaltic andesite of Parkdale Basaltic andesite of Parker Creek Basaltic andesite of Parker Mountain Basaltic andesite of Patsy Lake Basaltic andesite of Paulina Lake Basaltic andesite of Pilot Butte Basaltic andesite of Potato Butte Basaltic andesite of Red Cone, bombs and cinders Basaltic andesite of Red Cone, lava flows Basaltic andesite of Red Hill Basaltic andesite of Ring Lake Basaltic andesite of Rock Cone Basaltic andesite of Roma Basaltic andesite of Ruddy Hill Basaltic andesite of Scoria Cone, lava flows Basaltic andesite of Scoria Cone, pyroclastic deposit Basaltic andesite of Scott Mountain Basaltic andesite of Sheeps Rump Basaltic andesite of Shirley Creek Basaltic andesite of Shitike Creek Basaltic andesite of Shitike Creek Headwall Basaltic andesite of Sims Butte Basaltic andesite of Sisi Butte Basaltic andesite of Sixmile Butte Basaltic andesite of Skyline Trail Basaltic andesite of South Fork Breitenbush River Basaltic andesite of South Sentinel Hills Basaltic andesite of Squaw Back Ridge Basaltic andesite of Steamboat Rock Basaltic andesite of Steel Bay Basaltic andesite of Stump Creek Basaltic andesite of Substitute Point Basaltic andesite of Sugarpine Ridge - lower Basaltic andesite of Sugarpine Ridge - upper Basaltic andesite of Sunset Spring Basaltic andesite of Surveyor Mountain Basaltic andesite of The Pinnacle Basaltic andesite of Three Fingered Jack Basaltic andesite of Timber Lake Basaltic andesite of Trout Creek Butte Basaltic andesite of Tumalo Mountain Basaltic andesite of Twin Craters Basaltic andesite of Twin Peaks Basaltic andesite of Union Creek, intrusive rock Basaltic andesite of Union Creek, lava flows Basaltic andesite of Union Peak, intrusive rock Basaltic andesite of Union Peak, lava flows Basaltic andesite of Union Peak, palagonitic cinders Basaltic andesite of Unnamed Lake Basaltic andesite of View Lake Basaltic andesite of Whiskey Creek Basaltic andesite of Whitehorse Bluff, cinders Basaltic andesite of Whitehorse Bluff, lava flows Basaltic andesite of Whitehorse Bluff, plugs Basaltic andesite of Whitehorse Creek, dike Basaltic andesite of Whitehorse Creek, lava flows Basaltic andesite of Whitehorse Creek, palagonitic tuff Basaltic andesite of Williams Crater Basaltic andesite of Williams Crater, cinders Basaltic andesite of Woodpecker Ridge Basaltic andesite of Yapoah Crater Basaltic andesite of Yogodzinski Basaltic andesite of bench northwest of Carl Lake Basaltic andesite of summit cone Basaltic andesite of summit cone postdating drift of Canyon Creek advance Basaltic andesite of the East Fork Basaltic andesite of the Oak Grove Fork Basaltic andesite of upper flanks Basaltic andesite perched above Babe Lake Basaltic andesite plug Basaltic andesite south of Crater Peak Basaltic andesite to dacite flows Basaltic andesite vent complexes Basaltic andesite vent deposits Basaltic andesite west of Arant Point Basaltic andesite west of Bear Bluff, cinders Basaltic andesite west of Bear Bluff, necks and minor lava Basaltic andesite west of Mazama Campground Basaltic andesite, andesite and rhyolite flows Basaltic andesite, andesite, & dacite lavas with minor interbedded tuffs (highly altered) & mudflows Basaltic andesite, andesite, and rhyolite flows Basaltic andesite, andesite, and rhyolitic flows Basaltic andesite, andesite, dacite, and latite plugs, dikes, and sills Basaltic andesites of Rimrock Springs Basaltic andesites of Willow Creek flats Basaltic andesitic dike Basaltic cinders Basaltic dikes Basaltic dikes and plugs Basaltic dikes and small plugs Basaltic flow rocks Basaltic flows and intrusions, basalt and basaltic andesite flows Basaltic flows and intrusions, basaltic intrusions Basaltic flows and intrusions, porphyritic basalt flows Basaltic greenstone Basaltic intrusions Basaltic intrusive rocks Basaltic intrusive rocks, undivided Basaltic intrusives Basaltic lava flows from Scott Mountain Basaltic lavas of Koch Mountain Basaltic lavas of Tumblebug Creek Basaltic lavas of Tumblebug Creek, flows Basaltic lavas of Tumblebug Creek, intrusive plug Basaltic plugs and dikes Basaltic pyroclastic rocks Basaltic sandstone Basaltic sandstone at Roy Creek Basaltic sandstone member of the Alsea Formation Basaltic sandstone member of the Astoria Formation Basaltic sandstone of Otis Junction Basaltic to andesitic vent deposits of the Wasson Formation Basaltic trachyandesite Basaltic tuff Basaltic vent complex of unit QTb Basaltic vent complex of unit Qbmp Basaltic vent complex of unit Qjl Basaltic vent complex of unit Tmb Basaltic vent complex of unit Tp Basaltic vent deposits Basaltic vent rocks Basaltic volcanic rocks Basaltic, basaltic andesite, andesite vent deposits Basalts of Metolius Bench Basalts of Tenino Bench Basanite Basanite and trachybasalt Basatlic andesite of Le Conte Crater Basement complex Basey member Basic Andesite Basic dikes, pyroxenite Basic dikes, rodingite Basic sills and dikes Bastendorff Formation Bastendorff Shale Bateman Formation Bateman Formation mudstone Beach and dune deposita Beach and spit sand Beach sand Beach sand and active dune deposits Beach, Bar, and Dune Sand Bear Creek Member Bedrock landslides Bedrock landslides, Pleistocene Beds at Detroit Beds at Sacchi Beach Beds of Bull Creek Begg Formation Belknap lava flow Bench gravels Bernard Formation Big Canyon Creek unit Big Canyon basalt member Big Obsidian Flow Biotite dacite Biotite hornfels formed from Hudspeth mudstones Biotite pyroxene diorite Biotite rhyolite Biotite schists of Yellow Jacket Road Biotite-hornblende leucotonalite to granodiorite Biotite-phyric flows and domes Biotite-quartz diorite Birdseye Creek Pluton Black clast breccia Black vitrophyre, gray tuff, and lithic ash-flow tuff Block-and-ash flow of Mount Jefferson Bonneville Flood deposits Boring Lava Boring Lavas Bostonite Boulder Creek Cone Boyd Spring cone Braided-fan alluvium Breccia pipe Brecciated argillite and chert Brecciated rhyodacite Breitenbush Formation Breitenbush Formation, Blowout Creek member Breitenbush Formation, Cleator Bend member Breitenbush Formation, Coopers Ridge Andesite member Breitenbush Tuff, undifferentiated Briggs Creek amphibolite Brisbois Formation Broken Formation, chert Broken Formation, marble, silicified marble, and dolomite Broken Formation, sedimentary rocks Broken Formation, tuff and reworked tuff Broken Formation, volcanic rocks Broken Formation, volcaniclastic rocks Browder Ridge plug Browder-Bunchgrass Formation Brush Creek formation Buchanan Ash-flow Tuff Buck Creek dacites, dome and flow Buck Creek dacites, flow Buck Creek dacites, porphyritic flow Buck Mountain Andesite Buff tuff Buff tuff, coarse-grained facies Buff tuff, fine-grained facies Buff tuff, lacustrine facies Buff tuff, vitrophyre Buford member Bunchgrass Ridge Formation Burn Creek sedimentary deposit Burnt River Schist Bushnell Rock Formation, Slater Creek member Bushnell Rock Formation, conglomerate Bushnell Rock Formation, debris flow deposits Calc-alkaline lavas Caldera-fill sedimentary rocks Caldera-fill tuff of Tower Mountain Camp Creek member, basaltic andesite and andesite Camp Creek member, vent deposits Camp Creek member, volcaniclastic rocks Camptonite Camptonite Intrusive Rocks Camptonite intrusive rock Camptonite intrusive rocks Canemah tephra Cannon Beach member Canyon Creek flow Canyon Creek member Canyon Creek moraines Canyon Mountain Complex Cape Falcon conglomerate Cape Foulweather Basalt Cape Foulweather Basalt, Intrusive basalt Caps Creek beds Cascade Basaltic Andesite Cascades Formation Cascades Formation, basalt flows Castle Rocks breccia Cataclysmic flood deposits Cataclysmic flood deposits, gravel facies Cataclysmic flood deposits, silt and sand facies Catastrophic flood deposits, channel facies Catastrophic flood deposits, coarse grained facies Catastrophic flood deposits, fine grained facies Cedarville Series Central Pumice Cone Century Drive Tuff Chert Cherty shale and metavolcanic rocks Chetco River Complex, diorite and quartz diorite Chetco River Complex, hornblende gabbro Chetco River Complex, metagabbro Chimney Rock Member, basaltic andesite and andesite Chimney Rock Member, lahar deposit Chimney Rock Member, tuff Chimney Rock Member, vent deposits Chinook ignimbrite member Chlorite-mica schists of Pearson Creek Cinder cone and fissure vent deposits Cinder cone deposits Cinder cone or small volcano Cinder cones Cinder cones deposits Cinder cones of olivine-basalt scoria Cinder deposits Cinder deposits of Deschutes Formation Cinder pit flow Cinder vent deposits Cinder-cone and fissure-vent deposits Cinder-cone deposits Cinnabar Tuff Tongue Clarno Formation Clarno Formation - Mudflows Clarno Formation - Painted Hills Dacite Clarno Formation - Pass Gulch Rhyodacite Clarno Formation - Tuff Clarno Formation - Undifferentiated Flows Clarno Formation andesite porphyry Clarno Formation rhyolitic intrusion Clarno Formation, undivided Clarno Formation--andesite flows and mudflows Clarno Formation--andesite plugs Clarno Group andesitic tuff breccia and flows Clarno lavas, andesitic basalt flows Clarno tuffs interbedded with lavas Clarno volcanic conglomerates Clastic sedimentary rocks Claystone Claystone of Red Hill Clinopyroxene basaltic andesite lavas Clinopyroxene-bearing andesite flows Clinopyroxene-phyric lava flows Clover Creek Fm., undifferentiated Clover Creek Greenstone Coal-bearing conglomerates and claystones Coaledo Formation Coaledo Formation, Lower Member Coaledo Formation, Middle Member Coaledo Formation, Upper Member Coaledo Formation, lower member Coaledo Formation, lower sandstone member Coaledo Formation, middle member Coaledo Formation, middle siltstone member Coaledo Formation, undifferentiated Coaledo Formation, upper member Coaledo Formation, upper sandstone member Coarse Missoula Flood deposits Coarse-grained facies, unit 1 Coarse-grained facies, unit 2 Coarse-grained facies, unit 3 Coarse-grained facies, unit 4 Coarse-grained tuffaceous rocks Coast Range Ophiolite, mafic volcanics Coast Range Ophiolite, serpentinized peridotite Coast Range Ophiolite, undiff. volcanic rocks Coastal Terrace Deposits Coastal marine-terrace deposits Coastal terrace deposits Cobb Creek shoshonite Cole Mountain basalt Colebrooke Schist Colebrooke Schist volcanic rock Colebrooke schist Colebrooke schist, metavolcanic rocks Colestin Formation Colestin Formation, basalt, basaltic andesite, and andesite Colestin Formation, conglomerate Colestin Formation, tuff Colestin Formation, undivided Colluvial and alluvial slope deposits Colluvial deposits Colluvium Colluvium and alluvium Colluvium and colluvium-blanketed bed rock Colluvium and talus deposits Columbia River Baasalt Group, Wanapum Basalt Columbia River Baasalt Group,Grande Ronde Geochemical Type Columbia River Basalt Columbia River Basalt Group Columbia River Basalt Group and related flows Columbia River Basalt Group flows Columbia River Basalt Group, Frenchman Springs Member Columbia River Basalt Group, Frenchman Springs Member (Wanapum Basalt) Columbia River Basalt Group, Grande Ronde Basalt, N1 Low MgO Chemical Type Columbia River Basalt Group, Grande Ronde Basalt, N2 Low MgO Chemical Type Columbia River Basalt Group, Grande Ronde Basalt, R2 Low MgO Chemical Type Columbia River Basalt Group, Grande Ronde Basalt, Winter Water Flow Columbia River Basalt Group, Pomona Member Columbia River Basalt Group, Priest Rapids Member Columbia River Basalt Group, Prineville chemical type Columbia River Basalt Group, Wanapum Basalt, Frenchman Springs Member Columbia River Basalt Group, undivided Columbia River Basalt dikes Columbia River Basalt group, lower part Columbia River Group Columbia River Group, rhyolitic facies Columbia River Group, undivided Columbia River basalt Columbia River basalt dikes Columbia River basalts Columbia River landslide material Complex of small intrusives Condrey Mountain Formation, muscovite- quartz schist Condrey Mountain terrane, graphitic schist Condrey Mountain terrane, greenschist Conglemerate Conglomerate Conglomerate and sandstone Conglomerate and sandstone of Cannery Hill Conglomerate of Hancock Canyon Conglomerate of The Palisades Conglomerate w/ intercalated sandstone lenses Conglomerate, sandstone and siltstone Conglomerate, sandstone, and gravels Conglomerate, sandstone, and siltstone Consolidated fluvial deposits Consolidated river gravel Contact metamorphic rocks Continental sedimentary rocks Coon Hollow Formation Coon Hollow Formation, flysch facies Coon Hollow Formation, sandstone-conglomerate facies Cooper Draw lahar Coquille River Cornucopia stock Corral Creek stock Cougar Creek complex Country rocks of the Illinois River complex, Briggs Creek amphibolite Country rocks of the Illinois River plutonic complex, Briggs Creek Amphibolite Country rocks of the Illinois River plutonic complex, harzburgite, dunite Cowlitz Formation Cowlitz Formation, Clark and Wilson sandstone member Cowlitz Formation, sandstone Cowlitz Formation, upper mudstone member Coyote Butte ignimbrite member Coyote Hills Foundation Group, Upper Basalt formation Coyote Hills Foundation Group, feeder dikes Coyote Hills rhyolite, flow dome complex, endogenous dome Coyote Hills rhyolite, flow dome complex, flow Coyote Hills rhyolite, laccoliths Coyote Hills rhyolite, piston intrusions Coyote Hills rhyolite, ring intrusions Coyote Hills rhyolite, vent flows and tuffs Coyote Hills rhyolite, volcanic plugs Crater-filling obsidian flow Cretaceous marine sedimentary rocks, Cape Sebastian sandstone and Hunter Cove Formation sandstone Cretaceous marine sedimentary rocks, Myrtle Group Cretaceous(?) conglomerate Cumulate dunite and peridotite Cumulate gabbro Dacite Dacite Dikes Dacite Intrusions Dacite Porphyry dikes and small plugs Dacite and Quartz Diorite Dikes Dacite and andesite Dacite and andesite intrusions Dacite and andesitic to dacitic volcaniclastic rocks Dacite and rhyodacite Dacite and rhyodacite dikes Dacite and rhyodacite dikes, plugs, and sills Dacite and rhyodacite lava Dacite and rhyodacite of ancestral Mount Mazama Dacite and rhyolite Dacite and rhyolite flows and dikes Dacite and silicic andesite Dacite avalanche(?) deposit in S. Fk. Breitenbush River Dacite below Llao Rock Dacite dome and flows Dacite east of Palisade Point Dacite flow Dacite flows Dacite flows and domes Dacite intrusive of Cougar Dam Dacite intrusives Dacite lava Dacite north of Castle Creek, agglutinate Dacite north of Castle Creek, dacite lava Dacite north of Long Ridge Dacite of Amota Butte Dacite of Babe Lake Dacite of Baby Bear Dacite of Big Cliff Dacite of Breitenbush Road Dacite of Campbell Butte Dacite of Cascade Viewpoint Dacite of Cavern Creek Dacite of Chaski Bay Dacite of Double Peaks Dacite of East Jefferson Park Dacite of Frederick Butte Dacite of Frog Lake Buttes Dacite of Graveyard Butte Dacite of Harvey Lake Dacite of Hole-in-the-Wall Park Dacite of Jeff Creek Dacite of Jefferson Park Falls Dacite of Kuckup Park Dacite of Lane Plateau Dacite of Middle Sister Dacite of Milk Creek Dacite of Milk Creek Crossing Dacite of Mill Creek Buttes Dacite of Mount Scott, Dacite of Mount Scott, cinder and agglutinate Dacite of Mount Scott, mudflow breccias Dacite of Munson Ridge Dacite of Munson Valley, breccia Dacite of Munson Valley, pyroclastic flows Dacite of Palisade Point Dacite of Park Butte Dacite of Patsy Lake Dacite of Phantom Cone Dacite of Plaza Lake Dacite of Pumice Castle, dacite lava flows Dacite of Pumice Castle, dacite pumice Dacite of Pyramid Butte Dacite of Russell Lake Dacite of S. Fk. Breitenbush Trail Dacite of Sentinel Rock Dacite of Shitike Bench - lower Dacite of Shitike Bench - upper Dacite of Skyline Trail Dacite of Soldiers Cap Dacite of South Fork of the Breitenbush River Dacite of South Sentinel Hills Dacite of South Sister Dacite of Steel Bay, lava and dikes Dacite of Steel Bay, pyroclastic-flow deposit Dacite of The Watchman, lava and dike Dacite of The Watchman, pyroclastic-flow deposits Dacite of The Watchman, vitrophyre Dacite of Todd Lake Dacite of Unnamed Lake Dacite of West Jefferson Park Dacite of Whitewater Creek Dacite of Whitewater Glacier - lower Dacite of Whitewater Glacier - middle Dacite of Whitewater Glacier - upper Dacite of Whitewater River Headwall Dacite of the Beaver Butte Dacite of the Western Cascades Dacite plug Dacite plugs Dacite porphyry Dacite south of Garfield Peak Dacite to dacitic andesite flows Dacite west of The Pinnacles Dacitic and rhyodacitic vent complex of unit Tmd Dacitic dikes Dacitic dikes and small plugs Dacitic tuff Dacitic tuff breccia Dairy Creek hornblende andesite Dalles Formation Dalles Formation--interbedded olivine basalt flows Danforth formation rhyodacite flows and rhyolitic tuffs Danforth formation tuffaceous sediments Dark gray to black olivine basalt flows in the Madras Formation Dark hornblende diorite Days Creek Formation Dayville Basalt Deadhorse Rim volcanics Debris avalanche deposits Debris avalanche of Ladd Creek Debris flow Debris-avalanche and debris-flow deposits Debris-flow deposits Deflation plain Deflation plain and beach sand Deformed intrusive rocks Deming Creek lahar Depoe Bay Basalt Depoe Bay Basalt, Intrusive basalt Deposits derived from Mount Hood volcano Deposits of the climactic eruption of Mt. Mazama, Wineglass Welded Tuff Deposits of the climactic eruption of Mt. Mazama, ignimbrite Deposits of the climactic eruption of Mt. Mazama, lithic breccia Deposits of the climactic eruption of Mt. Mazama, pumice-fall deposit Deschutes Formation Desert Spring Tuff Devils Canyon Formation, basalt and basaltic andesite Devils Horn flow Devine Canyon Ash-flow Tuff Devine Canyon Tuff Devine Canyon ash-flow tuff Devitrified stony tuff Diabase Diabase and basalt intrusions Diabase dikes Diabase dikes and dike complexes Diabase intrusive rocks Diabase sill Diabase, gabbro, and basalt Diatomite Diatomite and volcaniclastic sediment Dike Dike and small intrusive rocks Dike complex Dike intrusions Dikes Dikes and intrusive bodies Dikes and plugs Dikes and sills Dikes and sills of Steens basalt Dikes and small intrusive bodies Dikes of Grande Ronde and Imnaha chemistry Dikes, plugs, and sills Dikes, sill and necks Dikes, sills, and necks Diktytaxitic Basalt, Diabase Diktytaxitic basalt flows Diktytaxitic basalt lavas of Metolius Bench Diktytaxitic olivine basaltic unit Diktytaxitic, high-alumina basalt Dinner Creek Ash-flow Tuff Dinner Creek Tuff Dinner Creek Welded Ash-flow Tuff Dinner Creek Welded Tuff Dinner Creek intrusives Dinner Creek pumice lapilli-tuff Dinner Creek welded ash-flow tuff Diorite Diorite and gabbro Diorite and related rocks Diorite feeder dike Diorite of Alexander Creek Diorite porphyry and related rocks Diorite sill Dioritic Intrusions Dioritic dikes, dacite Dioritic dikes, dacite porphyry Dioritic intrusive rocks Dioritic porphyry Dioritic porphyry and hornblende-rich dikes Dixie Butte Meta-andesite Dome-related rhyolites, endogenous domes and feeders Dome-related rhyolites, exogenous domes, flows and feeders Domes and flows Dooley rhyolite breccia Dotahn Formation, chert Dothan Formation Dothan Formation, Semischist and phyllite Dothan Formation, basalt Dothan Formation, chert Dothan Formation, conglomerate Dothan Formation, lava flows Dothan Formation, marine sandstones, siltstones, chert and conglomerate Dothan Formation, mudstone matrix melange Dothan Formation, phyllitic siltstone and metagraywacke Dothan Formation, pillow basalts and tuffs Dothan Formation, sedimentary rocks Dothan Formation, sedimentary unit Dothan Formation, shale and sandstone Dothan Formation, tuff Dothan Formation, turbidite sandstone broken formation Dothan Formation, volcanic breccia Dothan Formation, volcanic rocks Dothan Formation, volcanic unit Doyle Creek Formation Drake Peak rhyolite flows Drake Peak rhyolite intrusion, 1st phase Drake Peak rhyolite intrusion, 2nd phase Drewsey Formation Drewsey Tuff Drift of Canyon Creek advance (of Cabot Creek glaciation of Scott, 1977) Drift of Suttle Lake advance (of Cabot Creek glaciation of Scott, 1977) Drift of early Neoglacial age Drift of late Neoglacial age Drinkwater Basalt Drinkwater basalt Dry Creek Member, basaltic andesite Dry Creek Member, tuff Dry Creek Member, undivided tuffaceous rocks and basaltic andesite Dry Creek Stock Dry Creek member, basaltic andesite Dry Creek member, undivided tuffaceous rocks and basaltic andesite Dune deposits Dune sand Dune sand and eolian deposits Dunite Dunite-Lherzolite Dutch Canyon Landslide Complex Dynamo-thermal aureole Eagle Butte-Shale City Member, basaltic andesite Eagle Butte-Shale City Member, dacite Eagle Butte-Shale City Member, dacite unit 1 Eagle Butte-Shale City Member, dacite unit 2 Eagle Butte-Shale City Member, dacite unit 3 Eagle Butte-Shale City Member, dacite vent deposits Eagle Butte-Shale City Member, mafic pyroclastic rocks Eagle Butte-Shale City Member, rhyolite Eagle Creek Formation Early rhyolitic domes and flows East Lake obsidian flows Eastern tholeiitic lavas Elephant Mountain Member Elephant Mountain member Elevated alluvial terrace deposits Elk Lake Formation Elk Subterrane, Galice Formation Elk Subterrane, Humbug Mountain conglomerate Elk Subterrane, volcanic rocks in Galice Formation Elkhorn Ridge Argillite Elkhorn Ridge argillite Elkhorn pluton Elkton Formation mudstone Ellensburg Formation Empire Formation Eocene sedimentary and volcanic rock undivided Eocene volcanic rocks Eolian deposits Eolian sand and ash Epiclastic silicic tuff and tuff breccia Epiclastic tuffaceous sediments Epidote amphibolites Epidotized zone Eruptive centers Escarpment cone flow Estacada formation Estuarine deposits Eugene Formation Eugene Formation marine sandstone Eugene Formation, micaceous, quartz sandstone Eugene Formation, tuff tongue Eugene Formation, volcanic sandstone and tuff Evolved Pleistocene preclimatic rhyodacite, felsite Evolved Pleistocene preclimatic rhyodacite, pumice-fall deposit Evolved Pleistocene preclimatic rhyodacite, vitrophyre Extensive, bouldery mudflow-hornblende andesite fragments Fallsview tephra Fan deposits Fan-delta Alluvium Fan-delta alluvium Fanglomerate Fans Fault breccia Feeder dikes for flows of Grande Ronde Basalt Feldspathic sandstone Felsic dikes Felsic intrusion, granodiorite Felsic intrusion, quartz diorite Felsic intrusive rocks Felsite flows Fern Ridge Formation Ferroandesite of Fiddlers Hell Fiddler Mountain Olistostrome, chert Fiddler Mountain Olistostrome, polymict conglomerate Fiddler Mountain Olistostrome, slaty argillite Fiddler Mountain olistostromal, undivided Fields Creek Formation Fields Creek Formation of the Aldrich Mountains Group Fill and spoils Fine Grained Alluvium Fine grained alluvium Fine grained tuffaceous sediments with carbonized plant remains Fine-grained alluvium Fine-grained and coarse grained member Fine-grained andesite Fine-grained basalt Fine-grained diorite, quartz diorite, granodiorite, and highly altered basaltic andesite and dacite Fine-grained facies, unit 3 Fine-grained facies, unit 4 Fine-grained intrusive igneous rocks Fish Lake complex basic stocks Fisher Formation Fisher Formation, flows of andesite Fissure-vent breccia Flood Basalts Flood andesite and dacite, undifferentiated Flood-plain deposits Floodplain deposits Floodplain deposits of the Willamette River and major tributaries Flournoy Formation Flournoy Formation of Baldwin Flournoy Formation, Camas Valley member Flournoy Formation, White Tail Ridge member Flow and fan deposits Flow east of Lava Cascade Flow Flow on middle north flank Flow on upper north flank Flow south of Sugarpine Butte Flow-banded basaltic-andesite flows Flow-banded rhyodacite and rhyolite lavas Flows and clastic rocks, undivided Flows and flow breccias Flows of normal magnetic polarity Flows of reversed magnetic polarity Flows, breccia, tuff, and sedimentary rocks Fluvial and colluvial sediments Fluvial and estuarine deposits Fluvial and lacustrine basinal sediments Fluvial and lacustrine deposits Fluvial and lacustrine sediments Fluvial and lacustrine(?) sedimentary deposits Fluvial channel deposits Fluvial deposits Fluvial fan delta deposits Fluvial gravels, sandstones, and siltstones Fluvial sediments Fluvial terrace deposits Fluviatile and lacustrine deposits Fluviatile and lacustrine sedimentary deposits Fluviatile deposits Fluviatile sand, gravel, and silt Foliated hornblende gabbro Foliated sedimentary and volcanic rocks Foliated sedimentary and volcanic rocks and marble Foots Creek Pluton Foots Creek Pluton, hornblende gabbro Forest Road Flows Forked Butte formation Fossiliferous sandstones and tuffaceous claystones Fossiliferous shale Frazier Mtn. basaltic andesite Frenchman Springs Basalt Frenchman Springs Member Frenchman Springs member Fresh volcanics Fresh, white pumice lapilli tuff Gabbro Gabbro and diabase Gabbro and meta-gabbro Gabbro and metagabbro Gabbro of Bear Skull Rims Gabbro of Gwynn Gulch Gabbro of Pine Creek Mountain Gabbro of Table Camp Gabbro of the transition zone Gabbro, pyroxenite, serpentine Gabbronorite of Carney Butte Gabbronorite of Ridenor Canyon Gable Creek Formation Galice Formation Galice Formation, agglomerates Galice Formation, contact alteration Galice Formation, graywacke, siltstone, shale, and chert Galice Formation, metavolcanic rocks Galice Formation, mudstones Galice Formation, siltstone, shale and chert Galice Formation, siltstone, shale, and chert Galice Formation, tuffaceous Galice Formation, tuffs and agglomerates Galice Formation, volcanic rock Galice Formation, volcanics Game Hut Obsidian Flow Gas-line Flow Gearhart Creek basalt Glacial and fluvial deposits Glacial and glaciofluvial deposits Glacial deposits Glacial deposits, undivided Glacial drift Glacial moraine Glacial moraine and outwash deposits Glacial outwash deposits Glacial till Glacial-fluvial deposits Glacio-fluvial deposits Glaciofluvial deposits Glaciogenic deposits, drift Glaciogenic deposits, older sedimentary deposits Glaciogenic deposits, outwash Glass Hill Volcanics Glassy Basalt Glassy andesite dikes and plugs Glassy basalt Glassy basaltic andesite Glassy basaltic andesite flows Glassy rocks Glassy rocks, undivided Glassy, partly welded tuff Glaucophane schist and related rocks Glenns Ferry Formation Glomerophyric basalt Glomerophyric olivine andesite Glomeroporphyritic andesite lava Glomeroporphyritic olivine basalt Glomeroporphyritic-2-pyroxene-bearing dacite lava Gnat Creek Formation Gnat Creek formation Goble Volcanics Goble Volcanics, basaltic andesite Goble Volcanics, tuff Gold Creek Greenstone Gold Hill pluton Gossan Grande Ronde Basalt Grande Ronde Basalt Formation, undifferentiated Grande Ronde Basalt Of The Columbia River Group Grande Ronde Basalt intrusions Grande Ronde Basalt pillow palagonite complexes, mudstone Grande Ronde Basalt subaerial basalt flows Grande Ronde Basalt, Middle Low MgO Geochemical Type Grande Ronde Basalt, High MgO Geochemical Type Grande Ronde Basalt, Low MgO Geochemical Type Grande Ronde Basalt, Lower Low MgO Geochemical Type Grande Ronde Basalt, Member of Ortley Grande Ronde Basalt, Member of Sentinel Bluffs Grande Ronde Basalt, Member of Winter Water Grande Ronde Basalt, Upper Low MgO Geochemical Type Grande Ronde Basalt, high Mg chemical type Grande Ronde Basalt, lower flows, normal magnetic polarity Grande Ronde Basalt, lower flows, reverse magnetic polarity Grande Ronde Basalt, normal polarity unit 2 Grande Ronde Basalt, reversed polarity unit 2 Grande Ronde Basalt, unassigned, reversely-magnetized, high-MgO basalt Grande Ronde Basalt, undivided Grande Ronde Basalt, upper flows, normal magnetic polarity Grande Ronde basaltic andesites and basalt Grande Ronde intrusives Grande Ronde vent agglutinate Granite Granite of Anthony Butte Granite of Clear Creek Granite of Isham Springs Granitic Plutonic Rocks Granitic intrusions Granodiorite Granodiorite and quartz-diorite intrusions Granodiorite and related intrusions Granodiorite and tonalite Granodiorite of Beaver Meadow Granodiorite of Bullrun Creek Granodiorite of Grouse Creek Granodiorite of Table Mountain Granodiorite porphyry-Bullrun Mtn. Granodiorite porphyry-Rastus Mtn. Granodiorite porphyry-Rough Ridge Granodiorite, quartz monzonite, quartz diorite, and diorite; stocks, pipes, and dikes Granophyric Gabbro Granophyric dikes and small plugs Granophyric ferrodiabase Granophyric gabbro Grants Pass Pluton Grants Pass Pluton, diorite Grants Pass pluton Graphite schist Gravel Gravel Creek strata Gravel and conglomerate Gravel and sand deposits Gravel and sand of the caldera Gravel deposits Gravel facies Gravel west of Gresham Gravel, tuff, and tuffaceous sediments Gravels Gravels and sands Gravels of Jim White Ridge Gray phyllite Gray to black, glassy welded tuff in the Madras Formation Grayback pluton, diorite Grayback pluton, gabbro and norite Grayback pluton, quartz diorite and tonalite Grayback, Sucker Creek and Thompson Ridge plutons and related dikes Graylock Formation Grays Creek Pluton Grays Peak Stock Grays River Volcanics Grays River volcanic rocks Graywacke and shale Graywacke, conglomerate, shale, and limestone Graywacke, shale, and limestone Graywacke, shale, and pillow lava Greenback Melange, andesite Greenback Melange, basalt Greenback Melange, chert Greenback Melange, diabase Greenback Melange, dunite Greenback Melange, gabbro Greenback Melange, mixed diabase and gabbro Greenback Melange, peridotite Greenback Melange, tuffaceous shale, phyllite, and argillite Greenback melange, serpentinite Greenschist Greenstone Greenstone, argillite, and metaserpentinite Greenstones and greenschists Gresham formation Gries Ranch Formation Grizzly Peak Member, basaltic andesite Grizzly Peak Member, lahar deposits Grizzly Peak Member, pyroclastic rocks Grizzly Peak Member, tuff Grizzly Peak Member, vent deposits Grizzly Peak member, basaltic andesite Grouse Creek Member Grouse Creek granodiorite porphyry Grouse Creek granodiorite porphyry-Late intrusives Guard Station inlier intrusions Hamlet Formation, Roy Creek conglomerate member Hamlet Formation, Sunset Highway sandstone member Hamlet Formation, Sweet Home Creek mudstone member Hamlet formation Hampton (?) Tuff Hancock dacite dome Harney Formation Hart Mountain section undivided Hart Mountain trachyandesite intrusions Harzburgite Harzburgite, w/ gabbro dikes Harzburgite, w/ plagioclase and gabbro veins Harzburgite, w/ plagioclase and plag-cpx veins Haystack andesite Hb andes. pyroclastic brecc. Hb dacite Hb-px andes Hb-px andes. Breccia Heppsie Formation Heppsie Formation, lower part Heppsie Formation, upper part Heppsie Mountain Member, basaltic andesite Heppsie Mountain Member, dacite tuff Heppsie Mountain Member, lava flows Heppsie Mountain Member, white tuff Herren Formation Hewlit Granodiorite High Casada lavas, andesite and dacite High Casade lavas, basalt and basaltic andesite High MgO Grande Ronde Basalt High bench gravels High silica Px andes. High terrace deposits High terrace gravels High-level gravel High-silica rhyolite domes and shallow intrusions High-silicia-aphyric andesite lava Higher marine terrace deposits Highly porphyritic basalt Hillsboro Formation Holocene Basalt (the Voltage Flow) Holocene Mazama deposits, undivided Holocene Mazama potholes Holocene and Quaternary alluvium Holocene and Quaternary debris fan deposits Holocene and Quaternary talus and colluvium Holocene eolian sand and silt Holocene man-made fill deposits Holocene modern lake deposits Holocene preclimatic rhyodacite, felsite Holocene preclimatic rhyodacite, pumice-fall deposits Holocene preclimatic rhyodacite, pumiceous carapace Holocene preclimatic rhyodacite, vitrophyre Horizontal columnar jointed basaltic andesite Hornblende Andesite Porphyry of Bull-of-the-Woods Hornblende Andesite/Diorite Hornblende Diorite of Elk Lake Creek Hornblende Quartz Diorite Porphyry of Twin Lakes Hornblende andesite Hornblende andesite dome, local mudflow Hornblende andesite tuff breccia Hornblende dacite Hornblende diabase dikes Hornblende diorite Hornblende gabbro Hornblende magnetite clinopyroxenite and magnetite clinopyroxenite Hornblende pumice Hornblende quartz diorite Hornblende rhyolite Hornblende-albite schist Hornblende-and 2-pyroxene-bearing dacite lavas Hornblende-and orthopyroxene-bearing dacite lava Hornblende-bearing andesite Hornblende-bearing basaltic andesite Hornblende-bearing nonwelded ash-flow tuff Hornblende-bearing tuffs Hornblende-bearing-2-pyroxene andesite lava Hornblende-bearing-orthopyroxene andesite lava Hornblende-bearing-rhyodacite pyroclastic-flow deposit of Mt. Jefferson Hornblende-biotite quartz diorite Hornblende-rich dikes and sills Hornblende-rich intrusive rocks Hornblendite and hornblende gabbro Hornbrook Formation Hornbrook Formation, Blue Gulch Mudstone member Hornbrook Formation, Ditch Creek Siltstone member Hornbrook Formation, Klamath River Conglomerate member Hornbrook Formation, Osburger Gulch Sandstone member Hornbrook Formation, Rancheria Gulch sandstone beds? Hornbrook Formation, Rocky Gulch Sandstone member Hornbrook Formation, Sandstone Hornbrook Formation, Sandstone and conglomerate Hornbrook Formation, mudstone Hornbrook Formation, sandstone Hornbrook Formation, sandstone and conglomerate Hornbrook Formation, siltstone Hudspeth Formation Humbug Mountain Conglomerate Humbug Mountain conglomerate Hunsaker Creek Formation Hunter Creek Basalt Hunter Creek basalt Huntington Formation Hurwal Formation Hyaloclastic sandstone member Hyaloclastite Hyde Formation Hydroclastic deposits Hypabyssal and vent rocks of the Heppsie Formation Hypabyssal rocks of the Heppsie Formation Hypersthene andesite Igneous and metamorphic rocks Ignimbrite Ignimbrite A Ignimbrite B Ignimbrite S Ignimbrite W Ignimbrite of Trailbridge Reservoir Ignimbrite of member H Illinois River plutonic complex, Briggs Creek amphibolite Illinois River plutonic complex, gabbro Illinois River plutonic complex, gneissic migmatite Illinois River plutonic complex, hornblende gabbro-diorite Illinois River plutonic complex, main phase Illinois River plutonic complex, marginal facies Illinois River plutonic complex, olivine gabbro Illinois River plutonic complex, serpentinized harzburgite and dunite Illinois River plutonic complex, tonalite and trondhjemite Illinois River plutonic complex, unserpentinized harzburgite, dunite, and chromite Imnaha Basalt Imnaha Basalt Formation Imnaha Formation, Blue Creek lentil Imnaha Formation, Norway member Imnaha Formation, Russel member Imnaha intrusion Inclusion-rich dacite Indurated tuffs Inferred distribution of unexposed Castle Rocks andesite Inferred distribution of unexposed Deschutes Formation rocks Ingle Tuff Tongue Interbed of Grouse Creek Interbed of Squaw Canyon Interbedded ash flows Intercalated tuffaceous sediments Interlake Obsidian Flow Intermediate and silicic ash flow tuff, unit 1 Intermediate and silicic ash flow tuff, unit 2 Intermediate and silicic ash flow tuff, unit 3 Intermediate and silicic ash flow tuff, unit 4 Intermediate andesite Intermediate andesite unit Intermediate basalt Intermediate basalt unit Intermediate dikes and small intrusive bodies Intermediate flows Intermediate intrusive rocks Intermediate lava flows Intermediate terrace deposits Intermediate to mafic lava flows Intermediate-age basalt lava flows and tephra deposits Intermediate-age basaltic andesite lava flows and tephra Internal basalt Intersertal orthopyroxene andesite flow Intracanyon basalt Intracanyon basalts Intracanyon olivine basalt flows Intrusion of Cougar Reservoir Intrusion, undifferentiated Frenchman Springs Intrusions Intrusions, basalt of Gingko Intrusive Basalt Intrusive Basalt, Undivided Intrusive Depoe Bay Basalt Intrusive Grande Ronde Basalt Intrusive Grande Ronde Basalt, intrusive breccia Intrusive and hypabyssal rocks of the Wasson Formation, basaltic and andesite intrusive rocks Intrusive and hypabyssal rocks of the Wasson Formation, dacitic dikes Intrusive and hypabyssal rocks of the Wasson Formation, hornblende dacite Intrusive and hypabyssal rocks of the Wasson Formation, intrusive rhyolite Intrusive and hypabyssal rocks of the Wasson Formation, vitrophyric dacite intrusive rocks Intrusive and hypabyssal rocks related to the Chimney Rock Member, andesite intrusive rocks Intrusive and hypabyssal rocks related to the Rio Canyon Member, basaltic andesite and andesite intr Intrusive and hypabyssal rocks related to the volcanic rocks of Grizzly Peak, basaltic andesite dike Intrusive andesite Intrusive andesite plugs Intrusive basalt Intrusive basalt and andesite intrusions Intrusive basalt and basaltic andesite Intrusive basalt porphyry Intrusive breccia Intrusive dacite Intrusive felsic rocks Intrusive igneous rock Intrusive intermediate rocks Intrusive pillow basalt Intrusive plugs Intrusive rhyodacite Intrusive rhyodacites Intrusive rhyolite and dacite Intrusive rock Intrusive rocks Intrusive rocks of Laurel Hill Intrusive rocks of unit QTb Intrusive rocks of unit Qbmp Intrusive rocks of unit Qbt Intrusive rocks of unit Tma Intrusive rocks of unit Tmd Intrusive rocks of unit Tp Intrusive rocks undivided Intrusive rocks, undifferentiated Intrusive rocks, undivided Intrusives Intruvise basaltic andesite Iron Gate member, basaltic andesite Iron Mountain Formation Irregular basalt intrusion Izee group graywackes, shales and sandstones Jack Creek formation Jack Creek moraines Jackson Butte ignimbrite member Jackson Buttes ignimbrite member Jacksonville Pluton Jacksonville pluton Jefferson Park moraines Jet Creek member Jet Creek member limestone John Day Formation John Day Formation - Lower Member John Day Formation - Middle Member: two cooling units of Picture Gorge Ignimbrite John Day Formation - Upper Member John Day Formation, undifferentiated John Day Formation--rhyolite domes and flows John Day Formation--rhyolite plugs John Day and Columbia River landslide material Josephine Ophiolite, amphibolite Josephine Ophiolite, cumulate gabbro Josephine Ophiolite, dunite Josephine Ophiolite, harzburgite Josephine Ophiolite, mafic dikes Josephine Ophiolite, mantle lithosphere portion Josephine Ophiolite, massive gabbro Josephine Ophiolite, peridotite Josephine Ophiolite, pillow lava and lava breccia Josephine Ophiolite, plagiogranite, tonalite, and albite granite Josephine Ophiolite, rocks of the crustal sequence Josephine Ophiolite, serpentinized peridotite Josephine Ophiolite, serpentized peridotite Josephine Ophiolite, sheeted mafic dikes Josephine Ophiolite, undivided Josephine Ophiolite, wehrlite Josephine Peridotite Josephine peridotite Jump Creek Rhyolite Jumpoff Joe Creek Pluton Juniper Canyon basalt member Junter Cove Formation Juntura Formation Juntura basalts Keasey Formation Keasey Formation, Jewell member Keasey Formation, Vesper Church Member Keasy Formation Keller Creek Shale Keratophyre and sill complex Kurry unit Lacomb Gravel Lacustrine and alluvial plain deposits Lacustrine and fluvial deposits Lacustrine and fluvial sediments Lacustrine and fluviatile deposits Lacustrine and fluviatile sedimentary rocks Lacustrine beds Lacustrine deposits Lacustrine deposits, silty and clayey phase Lacustrine sedimentary deposits Lacustrine sedimentary rocks Lacustrine sediments Lahar Lahars Lake Creek Member, basalt and basaltic andesite Lake Creek Member, vent agglutinate Lake and eolian deposits Lake and stream deposits Lake and stream sediments Lake bed deposits and sandstone Lake beds Lake deposits Lake sediments Laminated welded tuff Lamprophyre Landslide Landslide Debris Landslide Deposits Landslide area Landslide areas Landslide debris Landslide deposit Landslide deposits Landslide deposits (grades into Qg) Landslide deposits and colluvium Landslide material Landslide-Columbia River Landslide-John Day Landslides Landslides and landslide deposits Landslides-blocky surfaces of andesite fragments and debris, some are older than the last glaciation Lapilli tuff Lapilli tuff Member of Yamhill Formation Lapilli tuff and unconsolidated airfall tuffaceous sediment Lapillistone Large-feldspar basalt Late Eocene Cole Mountain Basalt Late Jurassic and Cretaceous (?) intrusives Late Triassic through Middle Jurassic intrusives Late Wisconsin moraines Late basalt Late basalt flows Lateritic soil Latest Jurassic sedimentary and volcanic rocks Otter Point and Dothan Formations Latest Jurassic sedimentary and volcanic rocks, Dothan and Otter Point Formation Latite flow Lava Lava Butte Flow Lava Cascade Flow Lava Cast Forest Flow Lava flows Lava flows and tuffaceous sediments Lava flows of Clarks Butte Lava of Bingham Ridge Lava of Marion Creek Lava of Marion Peak Lava of Turpentine Peak Lava of the Three Pyramids Lavas and pyroclastic brecia of olivine-bearing dacite Lavas of Battle Ax Mountain Lavas of Black Canyon Lavas of Black Canyon, plug Lavas of Collawash Mountain Lavas of Hardesty Mountain Lavas of Lookout Point Lavas of Sardine Mountain Lavas of Scorpion Mountain Lavas of Sugarloaf Mountain Lavas of Triangulation Peak Lavas, dikes, pyroclastic breccia and agglomerate of olivine-and orthopyroxene-bearing andesite Lawson Mountain mudflow Laycock Graywacke Leffler Gravel Leslie Gulch Ash-flow Tuff Leucogranodiorite of Trail Creek Light brown, hydrated pumice-lapilli tuff, partly reworked Light-colored fluvial and lacustrine tuffs; finer grained correlatives of Tcmf Limestone Linn Gravel Lion's Head orthopyroxene-intracanyon andesite lava Lithic ash-flow tuff and tuff Lithic tuff Lithic tuff of Soldier Creek Lithic-rich pumiceous ash-flow tuff Little Butte Formation Little Butte Volcanic Series Little Butte Volcanic Series; andesite flows Little Butte Volcanic Series; basaltic andesite and olivine basalt flows Little Butte Volcanic Series; rhyodacitic welded tuff Little Butte Volcanic Series; tuff Little Butte Volcanic series, Dacite porphyry flows Little Butte Volcanic series, Dacite porphyry intrusion Little Butte Volcanic series, Mafic flows Little Butte Volcanic series, Mafic intrusion Little Butte Volcanic series, Mult-lithic breccia Little Butte Volcanic series, Tuffs Little Butte Volcanics Little Butte Volcanics, andesite Little Butte Volcanics, basalt Little Butte Volcanics, basalt and basaltic andesite Little Butte Volcanics, dacite Little Butte Volcanics, dacite and rhyodacite Little Butte Volcanics, porphyritic andesite Little Butte Volcanics, pyroclastic flows Little Butte Volcanics, tuffaceous volcaniclastic rocks Little Butte Volcanics, undivided Little Butte Volcanics, welded to nonewelded ash-flow tuff Little Butte volcanic rocks-older basalts Littlefield Rhyolite Littlefield rhyolite Local patches of basalt and andesite flows Local sedimentary tuff beds Local thin mudflow Locally quartzose metasedimentary rocks Loess Loess and associated fluvial deposits Lonesome Formation Lonesome and Trowbridge Formation of Lupher (1941) Lookingglass Formation Lookingglass Formation of Baldwin Lookingglass Formation, Bushnell Rock member Lookingglass Formation, Bushnell Rock member, conglomerate Lookingglass Formation, Olalla Creek member Lookingglass Formation, Olalla Creek member, sandstone Lookingglass Formation, Tenmile member Lookingglass Formation, Tenmile member, mudstone Lorane Shale Louse Creek Pluton Low MgO Grande Ronde Basalt Lower Andesite formation Lower Andesite sequence Lower Big Basin Member claystones Lower Clarno Formation Lower Clarno Formation-Helfin Creek Member: pyroxene andesite Lower Clarno Formation-Ross Flat Member: epiclastic sedimentary rocks with mudflows & andesite lavas Lower Clarno Formation-Ross Flat Member: ignimbrite Lower Cretaceous and Upper Jurassic rocks Lower John Day Formation Lower Jorn Lake member Lower Tuff of Pine Creek Lower Umpqua Member Lower Umpqua member Lower andesite Lower andesite and dacite Lower andesite sequence Lower andesite unit Lower andesitic group Lower andesitic pyroclastic rocks Lower arkosic sandstone and conglomerate Lower basalt Lower basaltic andesite flow Lower basaltic andesites Lower calc-alkaline lava flows Lower calc-alkaline rhyodacite flows Lower ferrodacite lavas Lower flows of normal magnetic polarity Lower flows of reversed magnetic polarity Lower marine terrace deposits Lower member Lower member of the Coaledo Formation Lower member, andesite flows, tuffs, and tuff-breccias Lower olivine basalt flows Lower palagonite tephra deposits Lower part of the Riddle Formation Lower pyroclastic unit Lower pyroclastics Lower rhyolite flow Lower sedimentary series Lower sedimentary unit-tuffaceous clays, sandstone, breccias, white fissile tuffaceous shale Lower sequence andesite Lower sequence basalt Lower sequence dacite Lower terrace deposits and alluvium Lower tholeiitic lava flows Lower tuff Lower tuff, interbedded basalt Lower tuffaceous sedimentary rocks Lower welded tuff Lowest exposed unit-quartz sandstones and mudflow breccias with andesite fragments Lucky Lass-type felsic pyroclastic deposits and tuffaceous sedimentary rocks Lucky Lass-type felsic pyroclastic deposits and tuffaceous sedimentary rocks, lithic ignimbrite Lucky Lass-type felsic pyroclastic deposits and tuffaceous sedimentary rocks, tuff breccia Luecogranite of Dutch Creek Madras Formation Mafic Intrusions Mafic and intermediate dikes and small intrusions Mafic and intermediate intrusions Mafic and intermediate volcanic rocks of pre-Suttle Lake age, undivided Mafic and ultramafic rocks Mafic and ultramafic rocks associated with granitic plutons Mafic dikes Mafic dikes and small intrusive bodies Mafic flows and dikes Mafic intrusion Mafic intrusions Mafic intrusive rocks Mafic intrusive unit Mafic plug Mafic rocks Mafic schists and siliceous metasedimentary rocks Mafic silicified hornfels Mafic to intermediate intrusive rocks Mafic to intermediate vent complexes Mafic vent complex Mafic vent complexes Mafic vent deposits Mafic vent deposits of John Day age Mafic vent structures Mafic vents Magill member Main Mudstone Member of Hudspeth Formation Main body of fine-grained Missoula Flood deposits Malheur Butte volcanics Man-modified land Manmade fill Marble Marble Mountain terrane Marine sandstone formation Marine sandstone unit Marine sedimentary and volcanic rocks Marine sedimentary rock Marine sedimentary rocks Marine sediments undifferentiated Marine sediments, undifferentiated Marine strata, undivided Marine terrace deposits Marine tuff and sandstone Marsh and peat Marsh deposits Martin Bridge Formation Mascall Formation Mascall Formation(?) Mascall lake deposits Mascall rhyolite Massive tuffs and agglomerates May Creek Schist Mazama pumice McEwen Creek Vitrophyre McKay Formation Meander-belt Alluvium Meander-belt alluvium Megacryst basaltic andes. Melange Melange and Broken Formation Member B basaltic andesite Member F basalts Member of Ortley Member of Sentinel Bluffs Member of Winter Water Meta-andesite Meta-igneous rocks Meta-volcaniclastic rocks and related amphibolite Metadiorite Metadiorite and gabbro Metagabbro Metagabbro, gabbro and peridotite Metagraywacke Metamorphic and igneous rocks, undivided Metamorphic complex Metamorphic rocks Metamorphic rocks, undivided Metamorphosed gabbro and basalt Metamorphosed igneous complex Metamorphosed igneous rocks Metamorphosed intrusions Metamorphosed intrusive rocks Metamorphosed sedimentary and volcanic rocks Metamorphosed sedimentary, pyroclastic, and volcanic rocks Metamorphosed tuffaceous sedimentary rocks Metamorphosed volcanic and sedimentary rocks Metasedimentary Rocks Metasedimentary rock Metasedimentary rocks of the tectonic melange of the Rattlesnake Creek terrane Metasedimentary rocks of the tectonic melange of the Rattlesnake Creek terrane, biotite schist Metasedimentary rocks of the tectonic melange of the Rattlesnake Creek terrane, chert Metasedimentary rocks of the tectonic melange of the Rattlesnake Creek terrane, limestone Metasedimentary rocks of the tectonic melange of the Rattlesnake Creek terrane, quartzite Metaserpentinite Metaserpentinite and talc Metashale, metamudstone, and quartz-rich metasandstone Metatonalite Metatroctolite Metatrondhjemite Metatuff Metavolcanic and related sedimentary rocks Metavolcanic and shallow intrusive rocks Metavolcanic rock Metavolcanic rock, undifferentiated Metavolcanic rocks Metavolcanic rocks of the tectonic melange of the Rattlesnake Creek terrane Metavolcanic rocks of the tectonic melange of the Rattlesnake Creek terrane, contact aureole Metavolcanic rocks of the tectonic melange of the Rattlesnake Creek terrane, mixed Metavolcanic, sedimentary, and igneous rocks Metavolcaniclastic rocks and greenstones Metcalf marine terrace Metolius Bench basalts Mickey Basalt Mickey Ignimbrite Microdiorite Microgabbro Microlitic and crystal-poor rhyolite Micronorite Microquartzite Middle Miocene basalt flows Middle Umpqua Member Middle and upper Big Basin member Middle calc-alkaline lava flows Middle marine terrace deposits Middle member Middle member of Snowshoe Formation Middle member of the Coaledo Formation Middle member, volcanic sedimentary rocks Middle porphyritic andesite Middle sedimentary unit-tuffaceous clays, sandstones, mudflows with a local red-white basal tuff Middle terrace deposits Mine dumps Mine tailings Mingled "andesite" of Park Ridge Mingled lava of Williams Crater Miocene andesitic lavas Miocene andesitic lavas, intrusive equivalent Miocene basalt Miocene basalt of Olive Reservoir Miocene basalt trachyandesite and trachyandesite of Bryant Mtn. Miocene basaltic andesite of May Reservoir Miocene dacite tuff and welded tuff of Snake Creek Miocene dioritic rocks Miocene rhyolite of Medicine Mountain Miocene sedimentary interbed in Columbia River Basalt Group Miocene silcic rocks Miocene trachyandesite of Brown Creek Miocene trachyandesite of Yainax Ridge Miocene trachyrhyodacite and rhyolite of Bly Mtn. Miocene trachyrhyodacite and rhyolite of Bug Butte Miocene trachyrhyodacite and rhyolite of Spodue Mtn. Miocene volcanic rocks Miocene volcanic rocks, basaltic and andesitic dikes Miocene volcanic rocks, intrusive and remnant volcanic plugs Miocene-Pliocene basaltic lavas Miocene-Pliocene basaltic lavas, flows Miocene-Pliocene basaltic lavas, vents and plugs Miscellaneous tuffs and/or pumiceous-near-vent agglutinate Missoula (Bretz) Flood Deposits Missoula (Bretz) Flood deposits Missoula Flood Deposits Missoula Flood deposits Missoula flood deposits, gravel Missoula flood deposits, silts and sands Mixed epiclastics-pyroclastics Mixed metavolcanic and metasedimentary rocks of the Onion Camp complex Mixed rock terrane Mixed rocks Mixed sedimentary, volcanic and intrusive rocks Mixed-rock terrane Mokst Butte Flows Molalla Formation Monument Mountain Basalt Monzodiorite Mount Ashland pluton Mount Ashland pluton, biotite granodiorite and granite phase Mount Ashland pluton, biotite-hornblende granodiorite Mount Ashland pluton, biotite-hornblende tonalite Mount Ashland pluton, diorite Mount Ashland pluton, quartz monzodiorite Mount Ashland pluton, zone of mixing Mount St. Helens-derived alluvium Mowich Group Mudflow Mudflow breccia Mudflow deposits Mudflows Mudflows and fanglomerates derived from Keyes Mtn.; intracanyon to Tcf2 Mudstone and siltstone of Cannery Hill Mudstone of Sutton Creek Mudstone of Sutton Creek, tuff beds Mudstone unit Murderers Creek Graywacke Muscovite granite Myrtle Group Myrtle Group, Days Creek Formation Myrtle Group, Riddle Formation Myrtle Group, basaltic beds Myrtle Group, dacite and diorite Myrtle Group, undifferentiated N1 Grande Ronde Basalt N1 magnetostratigraphic unit N2 Grande Ronde Basalt N2 High MgO Chemical Type N2 magnetostratigraphic unit Near channel gravel Near channel sand and silt Nelson Marble Nelson marble Nepheline Syenite Nestucca Formation Nestucca Formation, Basalt, breccia, and pillows Nestucca Formation, Camptonitic extrusive rocks Netarts Bay member Nicely Formation No name in explanation Nonmarine gravel Nonmarine sedimentary deposits Nonporphyritic felsic glassy andesite Nonporphyritic felsic hypersthene andesite Nonporphyritic olivine, small augite andesite Nonporphyritic quartz-bearing andesite, local mudflow Norite Norite of Badger Butte North Fork tonalite North Gearhart andesite North Gearhart basaltic andesite North Summit Flows Northrup Creek formation Nye Mudstone Obsidian dikes Obsidian flow Obsidian flows Oceanic metavolcanic rocks Oceanic sedimentary rocks Officer member Old alluvium Old channel gravels Old river gravel deposits Older Outwash deposits Older Triassic rocks Older alluvial deposits Older alluvial fan deposits Older alluvium Older alluvium, undivided Older andesite Older aphyric basaltic andesite Older basalt Older basalt and basaltic andesite Older basaltic andesite Older basaltic andesite of Cascade Range Older basaltic andesite of Mt. McLoughlin Older cinder cone deposits Older cinder deposits Older dacite Older fluvial and estuarine deposits Older fluvial terrace deposits Older gravels Older intracanyon basalt flows Older intrusions Older lake deposits Older loess Older mafic vent complexes Older olivine-bearing dacite Older palagonite tuff Older porphyritic basaltic andesite Older pyroclastic deposits of basaltic and andesitic cinder cones Older rhyolite and dacite lava flows and tephra Older river terrace deposits Older sedimentary rocks Older terrace deposits Older terrace gravels Older till Older tuffaceous and sedimentary rocks Older volcaniclastic sediments and lavas Oldest basalt andesite lava flows and tephra deposits Oldest basalt lava flows Oldest till deposits Oligocene (?) volcanic rocks Oligocene Sediment Oligocene Volcanic Rocks Oligocene and Eocene sedimentary rock undivided Oligocene and Eocene sedimentary rocks undivided Oligocene and lower Miocene tuffs and lavas Oligocene basalt and basaltic andesite with minor volcaniclastic sedimentary rocks Oligocene intrusives, gabbro and diorite dikes and sills Oligocene marine sediments, undifferentiated Oligocene volcanic rocks Oligocene-Miocene lavas, undifferentiated, flows Oligocene-Miocene lavas, undifferentiated, plugs Oligocene-Miocene rhyodacitic lavas Olistostromal blocks Olivine andesite Olivine andesite intrusions and flows Olivine andesite of Squaw Butte Olivine basalt Olivine basalt and andesite of Gum Boot Canyon Olivine basalt and basaltic andesite Olivine basalt and basaltic andesite of Pigeon Praire Olivine basalt flows Olivine basalt flows and scoria Olivine basalt flows, basalt flow breccia Olivine basalt lava flows Olivine basalt lava flows and cones Olivine basalt lavas Olivine basalt of Gum Boot Canyon Olivine basalt of Twelvemile Table Olivine basalt sheet flows Olivine basaltic andesite Olivine basaltic andesite and aphyric basaltic andesite Olivine bronzite cumulate Olivine clinopyroxenite Olivine gabbro Olivine websterite Olivine-and 2-pyroxene-bearing basaltic andesite and andesite lavas Olivine-augite-phyric basalt Olivine-bearing basaltic andesite Olivine-clinopyroxene heteradcumulate Olivine-clinopyroxene-bearing basaltic andesite lavas Olivine-rich peridotite Onion Camp complex, amphibolite gneiss Onion Camp complex, chert Onion Camp complex, metavolcanic and metasedimentary rocks Onion Camp complex, peridotite Onion Camp complex, serpentinite Onion Camp complex, undivided Opx andes. Opx andes. at Reservation Pt. Orthopyroxene-bearing rhyodacite dome Ortley and Umtanum members Ortley member Ortley unit Other intrusive rocks Otter Point Formation, chert Otter Point Formation Otter Point Formation chert Otter Point Formation volcanic rocks Otter Point Formation, basalt Otter Point Formation, blueschist Otter Point Formation, sedimentary rock Otter Point Formation, volcanic rock Outerson Formation Outlook tephra Outwash Outwash deposits Outwash of Evans Creek age Outwash of Jack Creek glaciation Outwash of Neoglacial age Outwash of Suttle Lake advance Oxyhornblende-bearing dacite flows Palagonite tephra deposits Palagonite tuff Palagonite tuff of Grande Ronde Basalt Paleomagnetically normal Metolius River intracanyon flows Paleomagnetically reversed Metolius River intracanyon flows Paleozoic Basement Paleozoic rocks Parasitic cones Parkette Creek sedimentary rocks Partly consolidated tuff and vitrophyre Payne Cliffs Formation Payne Cliffs Formation, basal conglomerate and associated sandstone Payne Cliffs Formation, lower part Payne Cliffs Formation, middle part Payne Cliffs Formation, undivided Payne Cliffs Formation, upper part Payne Cliffs Formation, volcaniclastic sandstone and pebbly sandstone Pediment Pediment gravels Pelton Basalt Member Pelton basalt member Peridotite Peridotite and serpentinite Peridotite tectonite Permian (?) rocks Permian intrusives Permian metasediments Peyerl Tuff Phyllite Phyllite and sedimentary rocks Phyllitic quartzite Phyllitic rocks Phyric high-silica rhyolite Phyric rhyolite Picture Gorge Basalt Picture Gorge Basalt of Columbia River Group Picture Rock Basalt Pike Creek Formation Pillow basalt Pillow basalt flow of Salmon River Formation Pillow breccia Pineville chemical type basalt flow with thick, glassy entablature Pioneer marine terrace Pittsburg Bluff Formation Pittsburg Bluff Formation, Clatskanie Conglomerate Pittsburg Bluff Formation, Conyers Creek Member Pittsburg Bluff Formation, East Fork Member Pittsburg Bluff Formation, laminated member Pittsburg Bluff Formation, siltstone member Pittsburg Formation Pittsburgh Bluff Formation Pittsburgh Bluff Formation, laminated sequence Placer mine tailings Placer-mine tailings and excavations Plagioclase basaltic andesite lava flows Plagioclase-bearing andesite flows Plagioclase-rich intrusive rocks Plagiogranite Plateau basalt Plateau basalts Plateau lavas Platy andesite flows Platy non porphyritic andesite Playa deposits Playa deposits and sand dunes Pleistocene basaltic lavas, flows Pleistocene basaltic lavas, vents and plugs Pleistocene basaltic rocks Pleistocene glacial deposits, undivided Pleistocene to Holocene basalts of the High Cascades Plio-Pleistocene terraced sediments Pliocene Volcanic Rocks Pliocene andesite of Adams Point Pliocene andesite of Antelope Valley Pliocene andesite of Cave Mtn. Pliocene andesite of East Branch Whiskey Creek Pliocene andesite of Esther Applegate Pliocene andesite of Hagelstein Park Pliocene andesite of Link River Pliocene andesite of Reservation Spring Pliocene andesite of Riddle Field Pliocene andesite of Skull Island Pliocene andesite of Sugar Hill Pliocene basalt of Applegate Butte Pliocene basalt of Bear Wallows Pliocene basalt of Boundary Spring Pliocene basalt of Bull Swamp Pliocene basalt of Captain Jack Lake Pliocene basalt of Chapman Reservoir Pliocene basalt of Cliney Flat Pliocene basalt of Cold Spring Pliocene basalt of Cooks Mtn. Pliocene basalt of Copeland Canyon Pliocene basalt of Cordelia Flat Pliocene basalt of Dead Indian Hill Pliocene basalt of Dehlinger Pliocene basalt of Devils Garden Pliocene basalt of Dry Lakes Flat Pliocene basalt of Elde Flat Pliocene basalt of Goodlow Rim Pliocene basalt of Grenada Butte Pliocene basalt of Grohs Reservoir Pliocene basalt of Hamaker Canyon Pliocene basalt of Harpold Dam Pliocene basalt of High Tableland Pliocene basalt of Horton Reservoir Pliocene basalt of Johns Waterhole Pliocene basalt of K Davis Hill Pliocene basalt of Keno Pliocene basalt of Klamath River Pliocene basalt of Knot Tableland Pliocene basalt of Langell Valley Pliocene basalt of Lenz Creek Pliocene basalt of Malin Pliocene basalt of McFall Reservoir Pliocene basalt of Merrill Siding Pliocene basalt of Middle Fork Trout Creek Pliocene basalt of Mills Creek Pliocene basalt of Nut Reservoir Pliocene basalt of Oatman Lake Pliocene basalt of Petric Park Pliocene basalt of Pine Ridge Pliocene basalt of Pope Reservoir Pliocene basalt of Prairie Reservoir Pliocene basalt of Shaws Camp Pliocene basalt of Smith Reservoir Pliocene basalt of Sycan River Pliocene basalt of Turkey Hill Pliocene basalt of Twomile Ridge Pliocene basalt of Whiskey Creek Pliocene basalt of Willow Valley Reservoir Pliocene basalt of Worlow Meadow Pliocene basalt of Yellow Jacket Flat Pliocene basalt trachyandesite of Algoma Incline Pliocene basalt trachyandesite of Bootleg Pond Pliocene basalt trachyandesite of Chicken Hills Pliocene basalt trachyandesite of Deer Spring Pliocene basalt trachyandesite of Dodds Hollow Pliocene basalt trachyandesite of Egert Spring Pliocene basalt trachyandesite of Moyina Hill Pliocene basalt trachyandesite of Olene Gap Pliocene basalt trachyandesite of Switchback Hill Pliocene basalt trachyandesite of Wigwam Reservoir Pliocene basaltic andesite and basalt trachyandesite of Altamont Pliocene basaltic andesite and basalt trachyandesite of Calimus Butte Pliocene basaltic andesite and basalt trachyandesite of Camp McLoughlin Pliocene basaltic andesite and basalt trachyandesite of Cox Reservoir Pliocene basaltic andesite and basalt trachyandesite of Dairy Pliocene basaltic andesite and basalt trachyandesite of Dockney Flat Pliocene basaltic andesite and basalt trachyandesite of Hamaker Mtn. Pliocene basaltic andesite and basalt trachyandesite of Horton Rim Pliocene basaltic andesite and basalt trachyandesite of Keno Dam Pliocene basaltic andesite and basalt trachyandesite of Klamath Falls Pliocene basaltic andesite and basalt trachyandesite of Short Lake Mtn. Pliocene basaltic andesite and basalt trachyandesite of Yainax Butte Pliocene basaltic andesite of Agency Spring Pliocene basaltic andesite of Anderson Creek Pliocene basaltic andesite of Barkley Spring Pliocene basaltic andesite of Buck Butte Pliocene basaltic andesite of Chase Mtn. Pliocene basaltic andesite of Chiloquin Pliocene basaltic andesite of Chitwood Spring Pliocene basaltic andesite of Corbell Butte Pliocene basaltic andesite of Cove Point Pliocene basaltic andesite of Crystal Castle Spring Pliocene basaltic andesite of Edgewood Mtn. Pliocene basaltic andesite of Fourmile Spring Pliocene basaltic andesite of Fremont Bridge Pliocene basaltic andesite of Freye Lake Pliocene basaltic andesite of Fuego Mtn. Pliocene basaltic andesite of Guard Pond Pliocene basaltic andesite of Hogback Mtn. Pliocene basaltic andesite of Hopper Hill Pliocene basaltic andesite of Indian Spring Ridge Pliocene basaltic andesite of Lobert Draw Pliocene basaltic andesite of Mahogany Ridge Reservoir Pliocene basaltic andesite of Midland Pliocene basaltic andesite of Naylox Mtn. Pliocene basaltic andesite of No Name Flat Pliocene basaltic andesite of Nuss Lake Pliocene basaltic andesite of Oregon Institute of Technology Pliocene basaltic andesite of Pearson Butte Pliocene basaltic andesite of Plum Hills Pliocene basaltic andesite of Rattlesnake Spring Pliocene basaltic andesite of Riverside Pliocene basaltic andesite of Rose Mary Pond Pliocene basaltic andesite of Round Lake Pliocene basaltic andesite of Round Mtn. Pliocene basaltic andesite of S Grade Reservoir Pliocene basaltic andesite of Saddle Mtn. Pliocene basaltic andesite of Shell Rock Spring Pliocene basaltic andesite of Short Pliocene basaltic andesite of Skillet Handle Pliocene basaltic andesite of Stevenson Park Pliocene basaltic andesite of Stiles Spring Pliocene basaltic andesite of Stukel Mtn. Pliocene basaltic andesite of Swan Lake Point Pliocene basaltic andesite of Tecumseh Spring Pliocene basaltic andesite of Telephone Draw Pliocene basaltic andesite of Telephone Flat Pliocene basaltic andesite of Trestle Pliocene basaltic andesite of Wildhorse Butte Pliocene basaltic andesite of Willow Pond Pliocene basaltic andesite of Wilson Bridge Pliocene basaltic andesite of Wood River Spring Pliocene basaltic andesite of Worden Pliocene basaltic andesite of Ya Whee Plateau Pliocene dacite Pliocene quartz diorite, Wind Mountain and Shell Rock quartz diorite Pliocene to Pleistocene basalts of the High Cascades Pliocene trachyandesite of Grouse Spring Pliocene trachyandesite of Ouxkanee Picnic Area Pliocene trachyandesite of The Bull Pasture Pliocene volcanic rocks Pliocene-Pleistocene basaltic lavas Plush Tuff Plush tuff Plutonic rocks Poikilitic olivine diabase Pomona Member Pomona basalt Pond Deposits Porphrytic basalt Porphyritic Basalt Porphyritic andesite Porphyritic andesite and basalt Porphyritic andesite and dacite Porphyritic andesite equivalent to Clp Porphyritic andesite flows Porphyritic andesite plugs Porphyritic andesite, equivalent to Clp1 Porphyritic andesitic and dacitic flows Porphyritic augite andesite and andesitic basalt Porphyritic basalt Porphyritic basalt and basalt andesite dike Porphyritic basalt and basaltic andesite dikes Porphyritic basaltic andesite Porphyritic basaltic andesite lavas Porphyritic basaltic andesite, contains sandstone fragments Porphyritic biotite rhyolite dikes Porphyritic dacite and andesite Porphyritic dacite and rhyodacite Porphyritic diorite dikes and sills Porphyritic granodiorite stock Porphyritic hornblende andesite and argillite Porphyritic hornblende andesite and argillite, argillite Porphyritic lavas of Chicken Creek Porphyritic olivine basalt Porphyritic platy altered augit-hypersthene andesite flow, locally domed Porphyritic pyroxene andesite unit Porphyritic rhyolite Porphyritic rhyolite flow Porphyritic rhyolite of Chicken Creek Porphyritic two-pyroxene andesite and dacite Possible intracaldera landslide deposits Post-CRB silt Prater Creek Ash-flow Tuff Prater Creek ash-flow tuff Pre-CRB Conglomerate Pre-CRB sandstone and siltstone Pre-Steens volcanic and sedimentary rocks, undivided Pre-Tertiary quartzite Pre-Tertiary rocks, undivided Pre-Tertiary ultramafic bedrock Pre-upper Triassic intrusive complex Priest Rapids Member Primary Loess Prineville Basalt Prineville Geochemical Type Products of Egan con Products of shield volcano of Kwolh Butte, undivided Products of shield volcano of Mount Bachelor, undivided Products of summit cone of Mount Bachelor, undivided Pumice Cone at Warm Springs Campground Pumice and ash Mt. Mazama Pumice and ash of Mount Mazama Pumice lapilli tuff Pumice-fall deposits Pumice-lapilli tuffs associated with rhyolite domes and overlain by rhyolite flows Pumice-ring deposit Pumice-ring deposits Pumice-ring deposits of Lost Lake Pumice-ring deposits south of East Lake Pumiceous alluvium of Kuamaksi Butte area Pumiceous sedimentary rocks Purple-pink clay tuff, a local saprolite Px andes. plug & dikes Pyroclastic and sedimentary rocks Pyroclastic and volcanic rock assemblage Pyroclastic breccia Pyroclastic deposits Pyroclastic deposits and associated sediments Pyroclastic dike Pyroclastic flow and debris-flow deposits Pyroclastic rock basaltic cinder cones Pyroclastic rocks Pyroclastic rocks and andesite flows Pyroclastic rocks and basaltic vents Pyroclastic rocks of basaltic cinder cones Pyroclastic rocks of cinder cones Pyroclastic unit Pyroclastic, volcanic flow, and volcaniclastic rocks Pyroclastic-flow and debris-flow deposits Pyroxene Andesite Porphyry of Big Slide Mountain Pyroxene Andesite/Diorite Pyroxene Basalt Pyroxene-Hornblende Andesite Porphyry of Mother Lode Mountain Pyroxene-Hornblende Dacite of South Dickey Peak Pyroxene-bearing andesite dikes Pyroxene-bearing andesite flows with interlayered olivine-bearing basalts Pyroxene-bearing tuff, agglomerate and flows Pyroxene-hornblende andesite Pyroxene-rich peridotite and pyroxenite Pyroxenite Pyroxenite and peridotite Pyroxenite of Gold Hill Quarternary sediment and sedimentary rocks, undivided Quartz Andesite Quartz Monzonite Quartz diorite Quartz diorite and albite granite Quartz diorite and granodiorite Quartz diorite and related rock Quartz diorite of Wolf Creek Quartz diorite, diorite, and gabbro Quartz diorite, trondhjemite, and diorite Quartz latite/rhyodacite Quartz monzonite Quartz porphyry Quartz-bearing ash-flow tuff Quartz-mica phyllite and schist Quartzite Quartzite and mica schist Quartzitic conglomerate Quaternary Alluvium Quaternary Basalts (Rim former) Quaternary alluvial fan deposits Quaternary alluvial gravel Quaternary alluvium Quaternary alluvium and Pleistocene terrace gravels Quaternary alluvium and estuarine sediments Quaternary andesite and basaltic andesite of Klamath Point Quaternary andesite of Applegate Peak Quaternary andesite of Brown Mountain Quaternary andesite of Devils Peak Quaternary andesite of Egan Springs Quaternary andesite of Fourmile Creek Quaternary andesite of Luther Peak Quaternary andesite of Mt. Harriman Quaternary andesite of Pelican Butte Quaternary andesite of Sand Creek Pinnacles Quaternary andesite of Spence Mtn. Quaternary andesite of Whiteface Peak Quaternary basalt of Aspen Lake Quaternary basalt of Big Bunchgrass Quaternary basalt of Dry Creek Quaternary basalt of Lajeunesse Creek Quaternary basalt of Long Lake Quaternary basalt of Lost Creek Cinder Pit Quaternary basalt of Maude Mtn. Quaternary basalt of Pearce Point Quaternary basalt of Pelican Service Station Quaternary basalt of Spring Creek Quaternary basalt of Sun Pass Quaternary basalt of Wocus Bay Quaternary basalt trachyandesite of Goose Egg Quaternary basaltic and andesitic rocks Quaternary basaltic andesite of Aspen Butte Quaternary basaltic andesite of Bald Hill Quaternary basaltic andesite of Bare Island Quaternary basaltic andesite of Bareface Butte Quaternary basaltic andesite of Buck Peak Quaternary basaltic andesite of Bunker Hill Quaternary basaltic andesite of Cherry Peak Quaternary basaltic andesite of Clover Butte Quaternary basaltic andesite of Coon Point Quaternary basaltic andesite of Crystal Springs Quaternary basaltic andesite of Hilltop Reservoir Quaternary basaltic andesite of Horse Creek Quaternary basaltic andesite of Lone Hill Quaternary basaltic andesite of Lost Peak Quaternary basaltic andesite of Nanny Creek Quaternary basaltic andesite of Odessa Quaternary basaltic andesite of Penn Creek Quaternary basaltic andesite of Rock Creek Quaternary basaltic andesite of Ruth Mtn. Quaternary basaltic andesite of Rye Spur Quaternary basaltic andesite of Seldom Creek Quaternary basaltic andesite of Shoalwater Bay Quaternary basaltic andesite of Spring Hill Quaternary basaltic andesite of Tiger Lily Spring Quaternary basaltic andesite of Tomahawk Ski Area Quaternary basaltic andesite of Varney Creek Quaternary basaltic andesite of Wizard Lake Quaternary beach sand Quaternary colluvium and talus Quaternary cover Quaternary dacite of Cavern Creek Quaternary dacite of Mt. Scott Quaternary dacite of Pumice Castle Quaternary dacite of Sand Creek Quaternary deposits Quaternary dike Quaternary dune sand Quaternary estuarine deposits Quaternary fluvial terrace deposits Quaternary glacial fan deposits Quaternary higher marine terrace deposits Quaternary landslide Quaternary landslide deposits Quaternary lower terrace Quaternary marine terrace deposits Quaternary material Quaternary middle marine terrace deposits Quaternary middle terrace Quaternary rhyodacite of Pothole Butte Quaternary rhyodacite of Scott Creek Quaternary sand deposits Quaternary sedimentary deposits Quaternary sediments Quaternary talus Quaternary terrace deposits Quaternary terraces Quaternary unconsolidated sediments Quaternary valley sediment deposits Quaternary volcanics, cinder cones Quaternary volcanics, flows of basaltic andesite and basalt, pyroclastic tuff, and breccia Quaternary-Tertiary cinder cones Quaternary-Tertiary intrusions Quaternary/Tertiary andesite of Eagle Ridge Quaternary/Tertiary andesite of Soloman Butte Quaternary/Tertiary basalt of Buck Island Quaternary/Tertiary basalt of Meva Quaternary/Tertiary basalt of Millsite Creek Quaternary/Tertiary basaltic andesite of Algoma Quaternary/Tertiary basaltic andesite of Bear Hollow Quaternary/Tertiary basaltic andesite of Boundary Butte Quaternary/Tertiary basaltic andesite of Doaks Mtn. Quaternary/Tertiary basaltic andesite of Government Creek Quaternary/Tertiary basaltic andesite of Halifax Creek Quaternary/Tertiary basaltic andesite of Hog Creek Quaternary/Tertiary basaltic andesite of Howard Bay Quaternary/Tertiary basaltic andesite of Kerby Hill Quaternary/Tertiary basaltic andesite of Lather Mtn. Quaternary/Tertiary basaltic andesite of Payne Canyon Quaternary/Tertiary basaltic andesite of Williamson River Campground Quaternary/Tertiary dacite of Dry Butte Quaternary/Tertiary sedimentary deposits Quaternary/Tertiary trachyandesite of Merritt Spring Quenched basalt R1 Grande Ronde Basalt R2 Grande Ronde Basalt R2 magnetostratigraphic unit Rail Cabin Argillite Rattlesnake Ash Flow Tuff Rattlesnake Ash-flow Tuff Rattlesnake Creek terrane (Marble Mountain terrane), amphibole schist, gneiss, and fels Rattlesnake Creek terrane (Marble Mountain terrane), serpentinized ultramafic rocks Rattlesnake Creek terrane (Marble Mountain terrane), siliceous metasedimentary rocks Rattlesnake Formation Rattlesnake Formation (?) Rattlesnake Tuff Rattlesnake ash-flow tuff Rattlesnake gravel Rattlesnake ignimbrite member; vitric, nonwelded to welded, crystal-poor tuff Rattlesnake welded tuff Recent Colluvium Recent alluvium Recent alluvium and sedimentary deposits, undivided Recrystallized gabbro Red flows and cinder Reddish-brown tuffaceous unit Remnants of old river gravels Reworked (Linn?) gravel Reworked (Willamette) silt Rhododendron Formation Rhyodacite Rhyodacite and dacite Rhyodacite and dacite plugs and dikes Rhyodacite domes and flows Rhyodacite flow Rhyodacite flows Rhyodacite flows and bedded tuffs Rhyodacite flows, dikes and plugs Rhyodacite lava Rhyodacite of Babe Lake Rhyodacite of Bear Bluff Rhyodacite of Burns Butte Rhyodacite of Cougar Creek Rhyodacite of County Line Rhyodacite of Duck Creek Butte Rhyodacite of Goat Peak - lower Rhyodacite of Goat Peak - upper Rhyodacite of Momma Bear Rhyodacite of Parker Creek Rhyodacite of Paulina Lake Rhyodacite of Paulina Peak Rhyodacite of Poppa Bear Rhyodacite of Pothole Butte, felsite Rhyodacite of Scott Creek Rhyodacite of Sharp Peak Rhyodacite of Tam McArthur Rim Rhyodacite of Whitewater River Rhyodacite of Whitewater River Headwall Rhyodacite of the postcaldera dome, rhyodacite breccia Rhyodacite of the postcaldera dome, rhyodacite lava Rhyodacite or dacite Rhyodacite plug Rhyodacite pumice deposit of the northeast flank Rhyodacite pumice deposit of the southwest flank Rhyodacite south of Crater Peak Rhyodacite southwest of Steelhead Falls Rhyodacite tuff Rhyodacite tuff-breccia Rhyodacite west of Cavern Creek Rhyolite Rhyolite Plug Rhyolite and andesite Rhyolite and breccia Rhyolite and dacite Rhyolite and dacite flows Rhyolite and dacite intrusions Rhyolite and quartz latite domes Rhyolite and rhyodacite Rhyolite and rhyodacite of Cascade Range Rhyolite and rhyodacite of Dry Creek Rhyolite and rhyolite vitrophyre at Star Mountain Rhyolite ash-flow tuff Rhyolite at Stockade Mountain Rhyolite breccia Rhyolite breccia dikes Rhyolite colluvium Rhyolite dike and plugs Rhyolite dikes Rhyolite dome Rhyolite dome and flows, undivided Rhyolite dome, dikes, and flows Rhyolite domes and flows Rhyolite domes and flows, lower flows are lithoidal, upper flows are flowbanded and lithophysal Rhyolite domes and intrusives Rhyolite flows Rhyolite flows and domes Rhyolite flows and flow breccia Rhyolite flows of Stephenson Mountain Rhyolite intrusions Rhyolite lava Rhyolite of Big Gulch Rhyolite of Cline Buttes Rhyolite of Corral Butte Rhyolite of Dog Butte Rhyolite of Double O Ranch Rhyolite of Dowell Butte Rhyolite of Indian Butte Rhyolite of Indian Creek Buttes Rhyolite of Iron Mountain Rhyolite of Iron Point Rhyolite of Last Chance Ridge Rhyolite of Mahogany Mountain Rhyolite of McCain Creek Rhyolite of McIntyre Ridge Rhyolite of Palamino Butte Rhyolite of Pine Mountain Rhyolite of Rock Mesa and Devils Hill chain of vents Rhyolite of the Silver City Range Rhyolite porphyry Rhyolite sills, dikes (rare), and irregular intrusions; probably of John Day age Rhyolite tuff Rhyolite vent rocks and near-vent rocks Rhyolite, rhyodacite, and dacite lava flows Rhyolite, rhyodacite, and dacite lava flows and domes, undivided Rhyolite, rhyodacite, and minor dacite Rhyolitic Obsidian Rhyolitic ash-flow tuff Rhyolitic ashflow tuffs Rhyolitic dikes Rhyolitic flow breccia, loose blocks Rhyolitic flow breccia, thick flows Rhyolitic flows and obsidian Rhyolitic intrusions Rhyolitic intrusive rocks Rhyolitic obsidian flows Rhyolitic plugs and dikes Rhyolitic to dacitic domes of flows near Deschutes River Rhyolitic tuff and ash-flow tuff Rhyolitic tuff and stream gravel Rhyolitic welded ash-flow tuff Rhyolitic welded tuff Ribbon chert Riddle Formation Riddle Formation, conglomerate Ridge-capping basalt Ridge-capping basalt and basaltic andesite Rio Canyon Member, basalt and basaltic andesite Rio Canyon Member, basalt, basaltic andesite and andesite Rio Canyon Member, lithic tuff Rio Canyon Member, tuff Rio Canyon Member, vent agglutinate Rio Canyon Member, welded tuff River Terrace Deposits River terrace deposits River terraces Ro Canyon Member, olivine andesite Robertson Formation Rocks of Barlow Ridge and Gunsight Butte Rocks of Sandy Glacier volcano Rocks of mafic vents Rocks of silicic vents Rocks of strato-volcanoes and domes Rocks of strato-volcanoes and domes, agglomerates and breccias Rocks of strato-volcanoes and domes, basaltic or andesitic Rocks of strato-volcanoes and domes, flows rhyodacitic Rocks of the caldera walls Rockslide deposits Rocky Point Formation Rogue Formation Rogue Formation, diabasic and gabbroic dikes Rogue Formation, lava flows Rogue Formation, mafic and intermediate sills and dikes Rogue Formation, massive lava and volcanic breccia Rogue Formation, undivided Rogue Formation, volcanogenic turbidites Rogue Formation, well bedded volcanogenic turbidite Rogue Valley Subterrane, undiff. Rogue/Galice Formations Rogue Volcanics? Root Creek tephra Rosebud member Roseburg Formation Roseburg Formation, basalt Roseburg member, basaltic sandstone Roseburg member, conglemerate Roseburg member, turbidite sandstone and mudstone Ross Flat Member Round Butte member Roxy Formation Roxy Formation, basalt, basaltic andesite, and andesite Roxy Formation, conglomerate Roxy Formation, lithic tuff Roxy Formation, tuff Roxy Formation, tuff breccia Roxy Formation, undivided Roxy Formation, vent deposits Roza Member Roza member Ruth diorite Saddle Mountain Basalt, Pomona member Saddle Mountains Basalt, Pomona Member Saddleback diabase Sager Creek Formation Sager Creek formation Salmon River Formation Sand Sand Mountain lava field Sand and conglomerate Sand and gravel Sand and gravel that postdates Missoula Floods Sand and gravel that predates Missoula Floods Sand and silt facies Sand dune deposits Sandstone and Tuff Member of Yamhill Formation Sandstone and argillite Sandstone and conglomerate Sandstone and sandy conglomerate Sandstone and siltstone Sandstone at Cape Meares Sandstone of Bewley Creek Sandstone of Garibaldi Sandstone of Trask River Sandstone of Whale Cove Sandstone unit Sandy River Mudstone Sandy River mudstone Sardine Formation Sardine Formation, Andesite Lava of Schreine Peak Sardine Formation, Hornblende Andesite flow of Silver King Mountain Sardine Formation, Hornblende Ignimbrite of North Dickey Peak Sardine Formation, Tuff of Pansy Basin Sardine Formation, andesite Sardine Formation, basalt Sardine Formation, lower member Sardine Formation, tuffaceous nonmarine sedimentary rocks Sardine Formation, upper member Sardine Formation, volcanic rocks Sardine Formation, volcanic rocks, undivided Scappoose Formation Scappoose Formation, interbeds Scar Mountain sedimentary rocks Schist Schist and quartzite Schist, subunit 1 Schist, subunit 2 Schist, subunit 3 Schist, subunit 4 Schistose Rogue Volcanics? Schistose mafic intrusive unit Schistose metasedimentary rocks Scorpion Mountain lavas Scotts Mills Formation Scotts Mills Formation, Abiqua Member Scotts Mills Formation, Crooked Finger Member Scotts Mills Formation, Marquam Member Scotts Mills Formation, undifferentiated Sediment gravity-flow deposits Sedimentary Rocks and deposits Sedimentary and pyroclastic deposits Sedimentary and pyroclastic rocks Sedimentary and silicic volcanic rocks Sedimentary and volcanic rocks Sedimentary deposits Sedimentary deposits and rocks Sedimentary deposits, undivided Sedimentary rocks Sedimentary rocks an deposits Sedimentary rocks and basalt Sedimentary rocks and basalt flows Sedimentary rocks and basalt of Cannery Hill Sedimentary rocks and deposits Sedimentary rocks and flows Sedimentary rocks and interbedded basalt flows Sedimentary rocks of Cougar Reservoir Sedimentary rocks of La Grande Sedimentary rocks of Mill Creek Sedimentary rocks of Starkey Sedimentary rocks of Ukiah Sedimentary rocks, undifferentiated Sedimentary rocks, undivided Sedimentary, volcanic and intrusive rocks Sedimentary, volcanic, and metamorphic rocks Sedimentary, volcanic, intrusive and metamorphic rocks Sediments Sediments, hyaloclastites, pillow lavas, and mud flows Sediments, pillow lavas, and mud flows Seekseequa basalt member Sentinel Bluffs Member Sentinel Bluffs member Sentinel Bluffs unit Serpentine Serpentine and serpentine-matrix melange Serpentinite Serpentinite and serpentinite matrix melange Serpentinized peridotite Serpentinized ultramafic rock Serpentinized ultramafic rocks Seven Devils marine terrace Sexton Mtn. Ophiolite, diabase and basalt Sexton Mtn. Ophiolite, diabase, gabbro, and basalt Sexton Mtn. Ophiolite, gabbro Sexton Mtn. Ophiolite, mafic flows and dikes Sexton Mtn. Ophiolite, sedimentary rocks Sexton Mtn. Ophiolite, volcaniclastic and volcanic rocks Shale Shale and minor chert Shale and mudstone of Mud Creek Shale and siltstone Shale of Sunny Valley Shale, mudstone, and sandstone of the Illinois Valley Shatter Zone Shaw member Shear zones Sheared serpentinite Sheep Creek lavas Sheeted diabase dikes Sheeted dike unit, undifferentiated Shelvin Park Tuff of Taylor (1981) Shevlin Park Tuff Shoreline deposits Siletz River Volcanics Siletz River Volcanics, Feldsparphyric basalt Siletz River Volcanics, Kings Valley siltstone member Siletz River Volcanics, basalt lapilli breccia unit Siletz River Volcanics, pillow basalt Siletz River Volcanics, subaerial basalt flows Siletz River volcanic series Silica-carbonate rock Siliceous ignimbrite Siliceous sinter Silicic dikes, plugs, and sills Silicic flow rocks and shallow intrusive rocks, unit 4 Silicic flows Silicic flows and tuff Silicic intrusive rocks Silicic tuff Silicic vent complexes Silicic vent deposits Silicic volcanic center Silicic volcanic rocks Silicic welded and non-welded tuff Silicic welded tuff Silicified Rhyolite Silicified tuff beneath the Spring Gulch rhyolite flows Siltstone Siltstone and sandstone of Cannery Hill Siltstone member of the Tyee Formation Siltstone of Hancock Mammal Quarry Silver Creek welded tuff Simtustus Formation Skamania Volcanic Series Slate and phyllite Slate, argillite, and chert Slate, argillite, chert, and conglomerate Slate, argillite, metachert, and conglomerate Slide Creek basalt Slide Creek member Slide block Slide block of unit QTb Slide block of unit Tbu Slide block of unit Tmb Slide block of unit Tmt Slightly welded, fine grained, crystal poor ash-flow tuff Slump deposits Small mafic volcanic centers Smuggler Cove formation Smuggler Cove formation, lower member Snow and ice Snowshoe Formation Soda Springs member, tuff Soda Springs member, volcaniclastic rocks Soda rhyolite intrusive Soda rhyolite of Burns Butte Soda rhyolite of Golden Ranch South Cinder Peak formation South Fork Little Butte Creek Member, tuff South Gearhart cone South Gearhart older andesite South Gearhart young andesite Sparsely porphyritic, densely welded, lithophysal ash-flow tuff Spencer Foramtion Spencer Formation Spring Gulch sandstone Springwater Formation Springwater Formation sandstone and mudstone Squaw Mountain pluton Squaw Mountain pluton, mafic intrusive Stabilized dunes Stable dune deposits Stable sand Steens Basalt Steens Basalt and upper part of Steens Mountain Volcanics, undivided Steens Basalt, tuffaceous sedimentary rocks Steens Mountain Volcanics Steens basalt Steens equivalent basalt and basaltic andesites Stephenson Mountain Member Stimson Mill bed Strath Terrace Strawberry Creek andesite Strawberry Volcanics Strawberry Volcanics, basaltic to dacitic flow member Strawberry Volcanics, olivine basalt member Strawberry Volcanics, pumice lapilli-tuff marker bed Strawberry Volcanics, rhyolitic lava flow and breccia member Strawberry Volcanics, volcaniclastic member Stream alluvium Stream alluvium and alluvial fans Stream deposits Stream gravel conglomerate Stream terraces Subaerial basalt flows Subaqueous pyroclastic deposits Submarine basalt flows Submarine basalt tuff and breccia Submarine basalt??Submarine Basalt Submerged outcrops of the caldera walls, undivided Subphyric-olivine-bearing, basaltic andesite lavas Sugarloaf Mountain volcanics Summer Lake Supplee Formation Surficial deposits Surficial landslides Surficial landslides, recent Surge-bedded silicic tuff Surge-bedded-palagonitic tuff Surveryor Flow Suttle Lake member Swisher Mountain Tuff Talc schist Talus Talus and colluvium Talus cone deposits Talus deposits Talus slope deposits Talus slopes Talus, debris of Cougar Peak-type dome rhyolites Talus, debris of Thomas Creek-type dome rhyolites Talus, debris of basalts Tectonized diorite Tenino ignimbrite member Tenmile Formation, Basin plain mudstone Tenmile Formation, mudstone and turbidite sandstone Tenmile Formation, slope mudstone Tenmile Formation, submarine fan channel sandstone Tenmile Formation, turbidite sandstone Tenmile Formation, turbidite sandstone and mudstone Tenmile Formation, undivided Terrace Terrace and bench gravels Terrace and fan deposits Terrace and interflow sand and gravel deposits Terrace deposits Terrace deposits of Sandy River Terrace gravel Terrace gravels Terrace gravels and alluvial fan deposits Terrace gravels and alluvial-fan deposits Terrace sand and gravel Terrace sands and gravels Tertiary Clarno Formation (undifferentiated) Tertiary Intrusive rocks Tertiary and Quaternary volcanic and sedimentary rocks and deposits, undivided Tertiary andesite Tertiary andesitic rocks Tertiary basalt Tertiary basaltic and basaltic andesitic rocks Tertiary basalts undivided Tertiary dike Tertiary gravels Tertiary hot spring cemented sedimentary deposits Tertiary hydrovolcanic deposits Tertiary intrusions (undifferentiated) Tertiary intrusive rocks Tertiary landslide deposits Tertiary marine and nonmarine sedimentary rocks Tertiary rhyodacite deposits Tertiary sedimentary deposits Tertiary sedimentary rocks Tertiary volcanic and sedimentary rocks Tertiary volcanics undifferent. Tetherow Butte member, Agency Plains basalt flow The Dome flow The Whitewater Tuff Thin ignimbrite - westernmost extension of unit Tholeiitic basalt and tholeiitic andesite dikes, plugs, and sills Tholeiitic basalt flows Tholeiitic basalts Tholeiitic lavas Tidal flat Till deposits Till of Canyon Creek advance (of Cabot Creek glaciation of Scott, 1977) Till of Evans Creek age Till of Jack Creek glaciation of Scott (1977) Till of Neoglacial age Till of Suttle Lake advance (of Cabot Creek glaciation of Scott, 1977) Till of neoglacial age Tillamook Volcanics Tillamook Volcanics, Upper porphyritic basalt flows Tillamook Volcanics, aphyric basalt Tillamook Volcanics, dikes Tillamook Volcanics, lower plagioclase porphyritic basalt Tillamook Volcanics, lower porphyritic basalt flows Tillamook Volcanics, subaerial dacite, rhyodacite, rhyolite Tillamook Volcanics, submarine basalt Tillamook Volcanics, upper plagioclase porphyritic basalt Tillamook Volcanics, upper submarine basaslt lapilli tuff and breccia Timber Mountain Pluton Timber Mountain Pluton, pyroxene gabbro Tims Peak Basalt Tims Peak basalt Tonalite and Quartz Diorite of Chetco River Complex Tonalite and granodiorite of the Wallowa Batholith Tonalite of Granite Meadows Tonalite of Wallowa Batholith Tourmaline bearing breccia pipes Trachyandesite and andesite Trachyandesite flows and associated hyaloclastite Trachybasalt Trachydacite intrusive rocks Trachytic andesite Trailhead andesite Travertine Trinity Creek Formation Trondhjemite of Coalmine Hill Trondhjemite of Johnson Creek Trondhjemite of Willow Creek Trondjemite of Catherine Creek Trout Creek Formation Troutdale Formation Troutdale Formation conglomerate Troutdale Formation mudstone and siltstone Troutdale Formation volcaniclastic sandstone Troutdale Formation, Lower Member Troutdale Formation, Upper Member Troutdale Formation, conglomerate Troutdale formation Tufa deposits Tuff Tuff Breccia Tuff along gas pipeline Tuff and andesite Tuff and lapilli tuff Tuff and tuffaceous sedimentary rocks Tuff at Short Mountain Tuff breccia Tuff fo Gimpl Hill Rd Tuff of Bear Flat Tuff of Ben Young Creek Tuff of Birch Creek Tuff of Bond Creek Tuff of Bond Creek, lower unit Tuff of Bond Creek, upper unit Tuff of Bully Creek Tuff of Cougar Reservoir Tuff of Currant Creek Tuff of Daniels Creek Tuff of Deep Canyon Tuff of Dexter Tuff of Dillard Road Tuff of Durkee Valley Tuff of Eagle Butte, nonwelded facies Tuff of Eagle Butte, nonwelded tuff Tuff of Eagle Butte, vitrophyre Tuff of Eagle Butte, welded facies Tuff of Eagle Butte, welded tuff Tuff of Espeland Draw Tuff of Fox Hollow Tuff of Fremont Canyon Tuff of Gimple Hill Rd. Tuff of Haystack Reservoir Tuff of Kern Basin Tuff of Long Ridge Tuff of Long Ridge and Trout Creek Mountains Tuff of Lookout Creek Tuff of Lost Creek Dam Tuff of Lower Bridge Tuff of McKenzie Canyon Tuff of Mosser Mountain Tuff of Oregon Canyon Tuff of Orphan Butte Tuff of Outerson Mountain Tuff of Pouge Holes Spring Tuff of Quaker Rd. Tuff of Rush Creek Tuff of Shale City, lacustrine facies Tuff of Shale City, undivided Tuff of Silver Creek Tuff of Smith Rock Tuff of South Willamette Street Tuff of Swamp Creek Tuff of Tepee Draw Tuff of The Peninsula Tuff of Tipsoo Butte Tuff of Trout Creek Mountain Tuff of Trout Creek Mountains Tuff of Trout Creek Mountains upper member Tuff of Wheeler Springs Tuff of Wheeler Springs, Hotchkiss lapilli member Tuff of Whitehorse Creek Tuff of Yellow Rock Tuff southeast of Paulina Peak Tuff undifferentiated Tuff unit Tuff west of China Hat Tuff, glassy breccia, and vitrophyre Tuff, lapilli tuff, agglomerate, and volcanic sandstone Tuff, sandstone, and diatomite Tuffaceous arkose Tuffaceous deposits Tuffaceous lacustrine and fluviatile sediments Tuffaceous lacustrine sedimentary rocks Tuffaceous lake and stream deposits Tuffaceous sandstone Tuffaceous sedimentary deposits Tuffaceous sedimentary rock Tuffaceous sedimentary rocks Tuffaceous sedimentary rocks and tuff Tuffaceous sedimentary rocks, basalt flows, and tuffs, undivided Tuffaceous sedimentary rocks, basalt, and welded tuff Tuffaceous sedimentary rocks, interbedded basalt flows and vent rocks, and landslide debris Tuffaceous sedimentary rocks, palagonite breccia and tuff, and mafic flows Tuffaceous sedimentary rocks, tuffs and silicic flows Tuffaceous sedimentary rocks, tuffs, and conglomerate Tuffaceous sedimentary rocks, tuffs, and interbedded basalt and andesite flows Tuffaceous sedimentary rocks, tuffs, and interbedded basaltic and andesitic flows Tuffaceous sediments Tuffaceous sediments and interbedded Venator Ranch Tuffaceous sediments of the upper Spring Gulch area Tuffaceous siltstone, sandstone and shale Tuffaceous siltstones, tuffs, and nonwelded ash-flow tuff Tuffaceous volcaniclastic rocks of the Western Cascades Tuffs Tuffs and flows, basalt and andesitic basalt flows Tuffs and flows, tuff rhyolite and dacitic, tuffaceous sedimentary rocks Tuffs and flows, tuff, tuff breccia, tuffaceous sedimentary rocks Tuffs of Black Creek Tuffs of Cougar Reservoir Tuffs of Rush Creek Tuffs undifferentiated Tuffs, tuffaceous sedimentary rocks, and minor interbedded flows Tumalo Tuff Tumalo Tuff and Bend Pumice of Taylor (1981) Tunnel Point Sandstone Twickenham Basalt Two pyroxene gabbro Tyee Formation Tyee Formation, Baughman Lookout member Tyee Formation, Baughman member Tyee Formation, Baughman member mudstone Tyee Formation, Hubbard Creek member Tyee Formation, Hubbard Creek member sandstone Tyee Formation, Tyee Mountain member Tyee Formation, delta-shelf facies Tyee Formation, turbidite facies Tyee Formation; Elkton Siltstone member Tyee Formation; basalt dike Tyee Mountain member Tyee Mountain member mudstone Tyee Mountain member of the Tyee Formation Tyee and Yamhill Formations Tygh Valley Formation Ultramafic and mafic rocks Ultramafic and mafic rocks related to Canyon Mountain Complex Ultramafic complex Ultramafic cumulate and tectonite rocks Ultramafic rock Ultramafic rocks Umatilla member Umpqua Formation Umpqua Formation, basalt member Umpqua Formation, basaltic sandstone Umpqua Formation, lower member Umpqua Formation, lower member, basalt Umpqua Formation, lower member, sedimentary rocks Umpqua Formation, middle member Umpqua Formation, middle member, sedimentary rocks Umpqua Formation, siltstone member Umpqua Formation, tuff member Umpqua Formation, upper member Umpqua Group, Camas Valley Formation Umpqua Group, marine sedimentary rocks Umtanum unit Unconsolidated deposits Unconsolidated deposits, undifferentiated Unconsolidated gravel Undiff. Flournoy Formation Undiff. Myrtle Group Undifferentiated Undifferentiated Boring Lava Undifferentiated Frenchman Springs flows Undifferentiated Oligocene and Miocene sedimentary rock units Undifferentiated Tertiary intrusions Undifferentiated alluvium Undifferentiated alluvium and sediments Undifferentiated andesite Undifferentiated andesite and dacite Undifferentiated ash-flow tuffs Undifferentiated basalt Undifferentiated basalt intrusions Undifferentiated basaltic andesite Undifferentiated basalts Undifferentiated colluvium and alluvium Undifferentiated fluviatile and volcanic rocks Undifferentiated glacial drift Undifferentiated metasedimentary, metavolcanic, metamorphic, and igneous rocks Undifferentiated old alluvium Undifferentiated surficial deposits Undifferentiated tuffaceous sediments Undifferentiated tuffs, bedded fossil-bearing tuffs at base with Pumice-lapilli tuffs overlying Undifferentiated volcanic rocks Undifferentiated volcaniclastic and clastic sedimentary rocks Undivided Cottonwood Creek felsic ignimbrite group Undivided Cottonwood Creek felsic ignimbrite group, pumice-rich ignimbrite Undivided Cottonwood Creek felsic ignimbrite group, pyroclastic flow sequence Undivided Cottonwood Creek felsic ignimbrite group, rhyodacite ignimbrite Undivided Cottonwood Creek felsic ignimbrite group, rhyodacite ignimbrite, lower unit Undivided Cottonwood Creek felsic ignimbrite group, rhyodacite ignimbrite, upper unit Undivided Umatilla flows Undivided basalt and basaltic andesite lava flows Undivided basalt flows of Columbia River Basalt age Undivided volcanic and sedimentary rocks Unit 1 Unit 2 Unit 3 Unnamed Basaltic Sandstone Unnamed andesite Unnamed basaltic andesite lavas of the Roxy Formation, vent agglutinate Unnamed basaltic andesite of the Roxy Formation, basaltic andesite Unnamed dacite Unnamed fan gravel Unnamed igneous complex Unstable dune sand Unwelded tuffs Upper Basalt (HAOT) Upper Clarno Formation-pyroxene andesite unit Upper Clarno Formation-quartz-bearing andesite unit Upper Clarno Formation-rhyolite flows Upper Cretaceous sedimentary rock Upper Dacite Upper Jurassic-lower Cretaceous plutons Upper Miocene lavas Upper Pliocene basalt Upper Pliocene mafic vent complex Upper Pliocene mafic vent complexes Upper Tertiary-Quaternary lavas, undifferentiated, flows Upper Tertiary-Quaternary lavas, undifferentiated, vents and plugs Upper Tuff of Pine Creek Upper Umpqua member Upper andesite Upper andesite of Horse Mountain Upper andesitic group, andesites Upper andesitic group, basalts and andesites Upper andesitic group, black basalts Upper andesitic pyroclastic rocks Upper arkosic sandstone, conglomerate and tuffaceous siltstone Upper basalt Upper basaltic andesite flow Upper calc-alkaline lava flows Upper calc-alkaline rhyolite and dacite flows and domes Upper dacite Upper ferrolatite lava flows Upper flow of normal magnetic polarity Upper flow of reversed magnetic polarity Upper flows of normal magnetic polarity Upper flows of reversed magnetic polarity Upper marine terrace deposits Upper member of the Coaledo Formation Upper member, hypersthene, augite andesite flows Upper olivine basalt Upper olivine basalt flows Upper palagonite tephra deposits Upper porphyritic augite-hypersthene andesite Upper porphyritic intermediate flows Upper pyroclastic tuff Upper pyroclastic tuff unit Upper pyroclastic unit Upper pyroclastics Upper rhyodacite Upper rhyolite flow Upper sedimentary unit-largely tuffaceous sandstones Upper sequence andesite Upper sequence basaltic andesite Upper sequence dacite Upper sequence olivine basalt Upper terrace deposits Upper tholeiitic lava flows Upper tuff-breccia Upper tuffaceous sedimentary rocks Upper volcanic sediments Upper welded tuff Upper-soil surface extensive thick saprolite marking an angular unconformity with Lower Clarno units Varicolored lacustrine and fluvial tuffs Varicolored tuffaceous claystone with interbedded vitric tuff Vent agglomerate, Keyes Mtn. Only Vent and hydrovolcanic deposits Vent breccia Vent deposits Vent facies Vent rocks Vent-fill breccia Very fine grained basalt Vesicular andesite Vester Formation Vitrophyre Vitrophyre and glassy welded tuff Vitrophyre and lithic ash-flow tuff Vitrophyre of Trout Creek Volaniclastic sediments Volcanic & volcaniclastic rocks of the lower part of the Breitenbush Tuff & interbedded ash flows Volcanic Group, augite andesite Volcanic Group, hypersthene-augite andesite Volcanic Group, undifferentiated volcanic rocks Volcanic and fluviatile deposits, undivided Volcanic and metavolcanic rocks Volcanic and sedimentary rocks Volcanic and sedimentary rocks, andesite flows Volcanic and sedimentary rocks, basalt flows Volcanic and sedimentary rocks, basaltic to rhyolitic pyroclastic flows Volcanic and sedimentary rocks, pyroclastic rocks or tuffaceous sedimentary rocks Volcanic and volcaniclastic rocks of the lower part of the Breitenbush Tuff Volcanic and volcaniclastic rocks of the upper part of the Breitenbush Tuff Volcanic and volcaniclastic rocks of the western Cascade Range, undivided Volcanic and volcaniclastic rocks undivided Volcanic and volcaniclastic rocks, undivided Volcanic and volcanogenic rocks Volcanic and volcanogenic rocks undivided Volcanic and volcanogenic rocks, andesite Volcanic and volcanogenic rocks, basalt Volcanic and volcanogenic rocks, undivided Volcanic breccia Volcanic breccias, White Butte area only Volcanic conglomerate Volcanic intrusions, mostly olivine or pyroxene or hornblende andesite Volcanic mud flow breccia Volcanic rocks Volcanic rocks of Chimney Rock, Volcanic rocks of Chimney Rock, tuff Volcanic rocks of Chimney Rock, vent deposits Volcanic rocks of Grizzly Peak, basaltic andesite Volcanic rocks of Grizzly Peak, lower unit, basaltic andesite Volcanic rocks of Grizzly Peak, lower unit, vent deposits Volcanic rocks of Grizzly Peak, pyroclastic unit Volcanic rocks of Grizzly Peak, pyroclastic unit, basaltic andesite Volcanic rocks of Grizzly Peak, tuff Volcanic rocks of Grizzly Peak, upper unit, basaltic andesite Volcanic rocks of Grizzly Peak, upper unit, lahar deposits Volcanic rocks of Grizzly Peak, upper unit, vent deposits Volcanic rocks of Grizzly Peak, vent deposits Volcanic rocks of the High Cascade Range and Boring Lava Volcanic rocks of the High Cascade Range and Boring Lava, undivided Volcanic rocks of the High Cascades Volcanic rocks of the South Fork Little Butte Creek and basaltic andesite of Lake Creek, basaltic an Volcanic rocks of the South Fork Little Butte Creek and basaltic andesite of Lake Creek, vent depos Volcanic rocks of the South Fork Little Butte Creek, basaltic andesite flow unit 1 Volcanic rocks of the South Fork Little Butte Creek, basaltic andesite flow unit 2 Volcanic rocks of the South Fork Little Butte Creek, dacitic tuff Volcanic rocks of the South Fork Little Butte Creek, tuff breccia Volcanic rocks, undifferentiated Volcanic sandstone and conglomerate Volcanic siltstone at Roger's Valley Volcanic tuff breccia Volcaniclastic debris flow Volcaniclastic deposits Volcaniclastic deposits of Limber Jim Creek Volcaniclastic rocks Volcaniclastic rocks at Wallace Creek Volcaniclastic rocks correlated to the Western Hayfork terrane Volcaniclastic rocks correlated with the Western Hayfork terrane Volcaniclastic rocks of Horse Creek Volcaniclastic rocks of Middle Fork Volcaniclastic rocks of Scorpion Mountain Volcaniclastic sandstones and siltstones Volcaniclastic sedimentary and volcanic rocks, Goble Volcanics Volcaniclastic sedimentary rocks Volcaniclastic sediments Volcaniclastic, pyroclastic, and sedimentary rocks Volcanics of Scravel Hill Volcanoclastic deposits of Limber Jim Creek Volcanoclastic rocks Volcanoclastic sedimentary rocks Volcanogenic sandstone and argillite Volcanolithic sandstone, conglomerate, and laharic breccia Walters Hill Formation Wanapum Basalt Wanapum Basalt of Columbia River Group, Frenchman Springs Member Wanapum Basalt, Frenchman Springs Member Wanapum Basalt, Frenchman Springs Member pillow palagonite complexes Wanapum Basalt, Frenchman Springs Member subaerial basalt flows Wanapum Basalt, Frenchman Springs Member, Basalt of Sand Hollow Wanapum Basalt, Frenchman Springs member Wanapum Basalt, Frenchmen Springs member Wanapum Basalt, Priest Rapids Member Wanapum Basalt, Priest Rapids member Wanapum Basalt, Roza Member Wanapum Basalt, intrusive Frenchman Springs Member basalt Wapshilla Ridge Member Warm Springs and Weberg Formation of Lupher (1941) Warm Springs member Warner Peak rhyolite Warner Peak rhyolite intrusions Warner Peak rhyolite undivided Warner Peak tuff Wasson Formation, White tuff Wasson Formation, andesite Wasson Formation, andesitic tuff breccia Wasson Formation, basalt, basaltic andesite, andesite and minor dacite Wasson Formation, basaltic andesite unit 1 Wasson Formation, basaltic andesite unit 2 Wasson Formation, basaltic andesite, undivided Wasson Formation, buff tuff Wasson Formation, dacite Wasson Formation, dacite tuff unit 1 Wasson Formation, dacite tuff unit 2 Wasson Formation, flow agglomerate Wasson Formation, lava flows Wasson Formation, lithic andesitic tuff Wasson Formation, tuff Wasson Formation, vent deposits Water Waterlaid and ash fall tuffs Weatherby Formation Weatherby Formation of Brooks Weathered terrace gravel Weberg member Wehrlite Welded Tuff of Twelvemile Table Welded ash-flow tuff Welded ash-flow tuff of Dale Welded ash-flow tuffs Welded lapilli tuff Welded lithic ash-flow tuff Welded pyroxene-bearing ash-flow tuff Welded soda-rhyolite tuff-breccia Welded to nonwelded ash-flow tuff Welded tuff Welded tuff of Devine Canyon Welded tuff of Double O Ranch Welded tuff of Prater Creek Welded tuff of member A Welded tuff, tuff, and lithic ash-flow tuff, undivided Welded tuff, tuff, and tuffaceous sedimentary rock West Branch ignimbrite West andesite Western Hayfork terrane Western Hayfork terrane, amygdaloidal or porphyritic andesite flows and pillow breccia Western Hayfork terrane, andesite flows and breccia Western Hayfork terrane, argillite Western Hayfork terrane, dacite flows, breccia, tuff, and hyaloclastite Western Hayfork terrane, limestone Western Hayfork terrane, quartzose sedimentary rocks Western Hayfork terrane, tuff and tuffaceous sedimentary rocks Western Hayfork terrane, volcaniclastic sedimentary rocks Western Triassic and Paleozoic Belt, amphibolite gneiss, schist, and impure quartzite Western Triassic and Paleozoic Belt, andesitic and dacitic tuffs, tuff breccia, and agglomerate Western Triassic and Paleozoic Belt, argillite Western Triassic and Paleozoic Belt, basalt Western Triassic and Paleozoic Belt, chert Western Triassic and Paleozoic Belt, contact metamorphosed rocks Western Triassic and Paleozoic Belt, dolomite Western Triassic and Paleozoic Belt, limestone Western Triassic and Paleozoic Belt, metadiabase and metagabbro Western Triassic and Paleozoic Belt, metamorphic igneous rocks, undivided Western Triassic and Paleozoic Belt, metasedimentary rocks, undivided Western Triassic and Paleozoic Belt, porphyritic augite andesite, basaltic andesite, and basalt flow Western Triassic and Paleozoic Belt, quartzite Western Triassic and Paleozoic Belt, serpentinized peridotite Western Triassic and Paleozoic Belt, sheared serpentinite Western Triassic and Paleozoic Belt, undivided Western tholeiitic lavas Whiskey Run marine terrace White Tail Ridge Formation, Berry Creek member White Tail Ridge Formation, Coquille River member White Tail Ridge Formation, Rasler Creek tongue White Tail Ridge Formation, Remote member White Tail Ridge Formation, mudstone White Tail Ridge Formation, undivided White Tail Ridge Formation, unnamed siltstone member Wild Sheep Creek Formation Wild Sheep Creek Formation, argillite-sandstone facies Wild Sheep Creek Formation, lower limestone marker unit Wild Sheep Creek Formation, lower volcanic facies Wild Sheep Creek Formation, undifferentiated limestone Wild Sheep Creek Formation, upper limestone marker unit Wild Sheep Creek Formation, upper volcanic facies Wildcat Basin Rhyolite member Wildcat Creek Welded Ash-flow Tuff Wildcat Creek Welded Ash-flow tuff Wildwood Landslide Complex Willamette Silt Windblown silt and sand Windy Ridge Formation Winter Water Member Winter Water member Winter Water unit Wolf Rock micronorite plug Xenolith-bearing-aphyric basaltic andesite of Middle Butte Yachats Basalt Yachats basalt Yakima Basalt Subgroup Of The Columbia River Basalt Group Yakima Basalt Subgroup of the Columbia River Basalt Group Yamhill Formation Yamhill Formation, basaltic mudstone Yamhill Formation, lower tuff unit Yamhill Formation, sandstone Yamhill and Tyee Formation, Undivided Yamhill-Tyee Formation, undivided Yaquina Formation Yaquina Formation, Siltstone Yellow mudflow unit in the West Branch Valley Young alluvium Young andesite of Davis Lake Young cinder cone and fissure vent deposits Young cinder-cone and fissure-vent deposits Young gravel and sand Young pmiceous mudflow Young pumiceous mudflow deposits Young rhyolite dome and flow of the caldera Young rhyolite of the upper southeast flank Young rhyolitic tephra Young sand and silt Young tephra Younger alluvium Younger and lower fine-grained Missoula Flood deposits Younger andesite flows Younger basalt Younger basalt and basaltic andesite Younger basalt flow Younger basaltic andesite Younger basaltic andesite of Cascade Range Younger cinder deposits Younger dacite Younger dacite, dome and flow Younger dacite, thick flow Younger hornblende dacite Younger lava flows Younger mafic vent complexes Younger palagonite tuff Younger pyroclastic deposits of basaltic and andesitic cinder cones Younger sedimentary deposits Younger sedimentary rocks Younger till Younger tuff and tuffaceous sedimentary deposits Younger tuffaceous sedimentary strata Youngest Basaltic Lavas (Intracanyon) Youngest basalt and basaltic andesite Youngest basalt lava flows and tephra deposits Youngest basaltic andesite lava flows and tephra deposits Youngest lava flows and tephra deposits Youngest outwash deposits Youngest till deposits Zoned flows and domes alluvial fan and slopewash deposits amphibolite andesite east of Spruce Lake andesite intrusive rocks andesitic intrusive rocks, principally plugs and dikes basalt of Canemah basalt of McCoy Creek basalt of Ortley basalt of Sand Hollow basalt of Winter Water basaltic andesite of Beaver Creek basaltic andesite of Fallsview basaltic andesite of Hunsinger basaltic andesite of Outlook basaltic andesite of Root Creek blue type chert clay derived from rhyolitic tuff, locally poorly stratified conglomerate conglomerate and sandstone (undifferentiated) crystal-rich ignimbrite member, locally crystal-poor, monwelded to strongly welded vitric tuff dacitic vitric tuff dactic vitric tuff and tuffaceous clay densely welded, sparsely porphyritic, highly oxidized ash-flow tuff dike dikes domes and associated flows of porphyritic hornblende-bearing dacite domes and flows of aphanitic rhyodacite feldspathic andesite flows fill fine-grained alluvial, lacustrine, and marsh deposits flow on west side of Sugarpine Butte gabbro green sandstone greenstone intrusive bodies of honblende-bearing dacite intrusive dikes of mafic composition landslides lava flows on the north side of Doolittle Flat lava flows, mudflows, and small amounts of tuffaceous rocks; lava flows are principally andesite lava flows, mudflows, and tuffs, chiefly of basaltic and andesitic composition light colored tuffaceous volcanic sandstones and siltstones limestone lower member mafic and ultramafic rocks marble mudflow mudflows on the west side of Doolittle Flat mudstone no data olivine andesite flows olivine andesite flows, small intrusions, and dikes olivine basalt flows olivine basalt flows and agglutinate pediment gravels pink type pre-Cretaceous(?) metasediments present-day glacial ice quartz basalt dikes rhyolite dome rhyolitic (in places perlitic) intrusive rocks rhyolitic (in places perlitic) intrusive rocks, principally plugs and dikes rhyolitic flows rhyolitic flows and domes rhyolitic intrusive rocks rhyolitic intrusive rocks, principally plugs and dikes rhyolitic vitric tuff and pumice-lapilli tuff sandstone serpentine serpentinite snow stratified tuffaceous clays stratified tuffaceous clays, vitric tuffs, and pumic-lapilli tuffs, with a sintered tuff, near base stream alluvium talus deposits tan sandstone terrace deposits terrace gravels tuffaceous claystone tuffaceous shale and siltstone containing abundant flora tuffaceous volcanic sandstones, chert pebble gravels tuffaceous volcanic sandstones, pumiceous volcanic conglomerates, pebble and cobble gravels upper member vent breccia, thin dikes, local agglomerate welded ash-flow tuff welded rhyolitic ash-flow tuff white type GEN_10_Geology_unit (10) Unknown JTRgd JTRs JTRsv Jc Jm Jop Jop? Js Js? Jss Ju Ju? Jub Jv KJds KJds? KJdv KJg KJgu KJi KJi? KJm Kc Ks Psv Pzs Pzsv QTa QTb QTb? QTba QTg QTib QTib? QTmv QTmv? QTp QTp? QTps QTs QTst QTvm QTvm? QTvs Qa Qal Qb Qba Qba? Qd Qf Qf? Qg Qgf Qgs Qgs? Ql Qlb Qls Qma Qmp Qpl Qrd Qs Qs? Qt Qt? Qyb Qyb? TRPsv TRPv TRPzg TRPzm TRPzs TRPzsn TRPzu TRs TRsv TRv Ta Tas Tas? Tat Tb Tb? Tba Tba? Tbaa Tbaa? Tbas Tc Tc? Tca Tca? Tcg Tcg? Tci Tco Tcp Tcs Tcss Tct Tct? Tcw Tfc Tfe Tfeb Tfee Tfee? Thi Thi? Ti Tia Tib Tib? Tig Tim Tim? Tlf Tm Tms Tmsc Tmsm Tmss Tmst Tmv Tmv? Tn Tob Tob? Tp Tpb Tps Tps? Tr Trb Trb? Trh Trh? Ts Ts? Tsd Tsf Tsff Tsfj Tsfj? Tsm Tsr Tss Tstv Tsv Tsv? Tt Tts Tts? Ttv Ttv? Ttvm Ttvm? Tu Tub Tub? Tus Tut Tvi Tvm Tvm? Tvs Twt Twt? Ty Tyq bc cm cs mc mr water GEN_11_DistanceFaults (11) 1 2 4 6 8 10 12 14 GEN_12_GeologyAge (12) Unknown Cretaceous Eocene Eocene/Miocene Eocene/Oligocene Jurassic Jurassic/Cretaceous Miocene Miocene/Pleistocene Miocene/Pliocene Miocene/Quaternary No data Oligocene Oligocene/Miocene Paleocene/Eocene Paleocene/Oligocene Paleozoic/Jurassic Paleozoic/Mesozoic Permian Permian/Triassic Pleistocene Pliocene Pliocene/Pleistocene Pliocene/Quaternary Quaternary Recent Tertiary/Quaternary Triassic Triassic/Cretaceous Triassic/Jurassic GEN_13_Geology_dissolve (13) Unknown batholith rocks intrusive rocks invasive extrusive rocks marine sedimentary rocks marine volcanic rocks melange rocks metamorphic rocks sediments terrestrial sedimentary rocks vent and pyroclastic rocks volcanic rocks volcaniclastic rocks GEN_14_NEHRP_dissolve (14) B C D E F GEN_15_PDX_NEHRP_Drillholes (15) <Null> 0 1 2 3 GEN_16_Bridges (16) GEN_17_Highways (17) GEN_18_CPT (18) GEN_19_SPT (19) GEN_20_Shearwave (20)