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Cross-cutting relations (vertical)
Cross-cutting relations: dikes cuttting mafic enclaves in granodiorite, Sierra Nevada (181020-50)
Download ImageCross-cutting relations
Cross-cutting relations: dikes cuttting mafic enclaves in granodiorite, Sierra Nevada (181020-50)
Download ImagePorphyritic Steens Basalt, Oregon
Large plagioclase phenocrysts in basalt of Steens Mountain (part of the Columbia River Basalt Group -CRBG- Oregon (181017-43)
Download ImageGlacial Valley, Steens Mountain, Oregon
Glacially carved, U-shaped valley into flows of the Steens Basalt, Big Indian Creek, Steens Mountain, Oregon (181017-23
Download ImageBase-surge deposit in Rattlesnake Tuff, Oregon
Base-surge deposit in Rattlesnake Ash Flow Tuff, Oregon (181017-9)
Download ImageSpherulites in tuff, Oregon (vertical)
Spherulites in Rattlesnake Ash Flow Tuff, Oregon (181017-3)
Download ImageRattlesnake Ash Flow Tuff, Oregon
Rattlesnake Ash Flow Tuff with stratified base-surge deposit at the bottom, Oregon (181017-1)
Download ImageCliffs of Ash Flow Tuff, Smith Rocks, Oregon
Cliffs of Ash Flow Tuff and Crooked River, Smith Rock State Park, Oregon. Cascade Volcanoes in background. (181016-57) pyroclastic
Download ImageRattlesnake Ash Flow Tuff, Oregon
Tuff and rhyolite dike at Smith Rock State Park, Oregon. (181016-32) pyroclastic
Download ImageCliffs of Ash Flow Tuff, Oregon (vertical)
Cliffs of Ash Flow Tuff, Smith Rock State Park, Oregon. (181015-22) pyroclastic
Download ImageCliffs of Ash Flow Tuff, Oregon
Cliffs of Ash Flow Tuff, Smith Rock State Park, Oregon (181015-20)
Download ImageEstuary: Siuslaw River, Oregon
Aerial view of Siuslaw River entering the Pacific Ocean near Florence, Oregon. Note the coastal dunes.
Download Imagegranite with minerals identified (pan)
granite close-up with biotite, quartz, orthoclase, and plagioclase feldspar minerals identified (pan) IP18-1012ce
Download ImageDuctile shear zone in gneiss (pan)
Ductile shear zone in gneiss, annotated on right (IP18-0982e)
Download ImageAlteration along fractures in serpentinite
Alteration along fractures in serpentinite (IP18-0971)
Download ImageDismembered pegmatite in gneiss
Folded and dismembered pegmatite in gneiss. Photo is about 1 meter high. (IP18-0966)
Download ImageStylolites offset by faults in quartzite
Stylolites and bedding offset by faults in quartzite (IP18-0942)
Download ImagePlagioclase phenocrysts in basalt
Plagioclase phenocrysts in Steens Basalt–the earliest part of the Columbia River Basalt Group (CRBG) (181017-66)
Download ImagePlagioclase phenocrysts in basalt
Plagioclase phenocrysts in Steens Basalt, the oldest part of the Columbia River Basalt Group (CRBG), Oregon. Photo is about 20cm across. (181118-65) close-up
Download ImageGlacial Valley, Steens Mountain, Oregon
Glacial, U-shaped valley carved into lavas of the Steens Basalt. Little Blitzen River, Steens Mountain, Oregon (181017-52)
Download ImagePlagioclase phenocrysts in basalt
Plagioclase phenocrysts in Steens Basalt, the oldest part of the Columbia River Basalt Group (CRBG), Oregon. Penny for scale. (181118-44)
Download Image
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