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Cretaceous Dakota Formation, Colorado
Steeply dipping beds of the Cretaceous Dakota Formation and interpretive sign near the east end of the I-70 roadcut, Golden, Colorado (201002-2)
Download ImageWest Pawnee Butte, Colorado
West Pawnee Butte, Colorado, capped by the Lower Ogallala Formation of the Great Plains aquifer. (201001-75)
Download ImagePawnee Buttes, Colorado (Pan)
Pawnee Buttes, Pawnee National Grassland, Colorado, capped by the Lower Ogallala Formation of the Great Plains aquifer. Oligocene White River Formation forms the fine-grained base of the buttes (201001-58)
Download ImageCross-bedded gravel, Pawnee Buttes, CO
Cross-bedded gravel of the lower Ogallala Group at Pawnee Buttes, Colorado (201001-44)
Download ImagePawnee Buttes, Colorado
Pawnee Buttes, Colorado, Miocene-Pliocene Ogallala Group forms the caprock; Oligocene White River Group forms the softer lower rock. (201001-38)
Download ImageBraided Channels, White River, Oregon
Braided channels developed on lahar and pyroclastic flows from Mount Hood, Oregon (200905-29)
Download ImageWhite River and Mount Hood, OR
White River, flowing over pyroclastic flows and lahars and Mount Hood, a stratovolcano in the Oregon Cascades (200905-23)
Download ImageColonnade in andesite, Oregon
Columnar jointing in a shallow andesite intrusion, Pilot Rock, Oregon. (200626-15)
Download ImageColonnade in andesite, Oregon
Moonrise behind columnar jointing in a shallow andesite intrusion, Pilot Rock, Oregon. (200626-8)
Download ImageOlivine phenocrysts in basalt
Olivine phenocrysts in Basalt of Salt Creek Falls photo is about 15mm across (200517-4)
Download Image12Ma Columbia River deposits, Oregon
Cliffs of pre-12Ma Troutdale Fm., deposits of Columbia River, Mitchell Point, Oregon (200228-49)
Download Image12Ma Columbia R. deposits., OR (vertical)
Cliffs of pre-12Ma Troutdale Fm., deposits of Columbia River, Mitchell Point, Oregon (200228-48)
Download ImageLatourell Falls, Oregon (vertical)
Latourell Falls drops over flows of the Grande Ronde Basalt of the Columbia River Basalt Group (CRBG) (190928-23)
Download ImageView west down Columbia Gorge, OR
View west down the Columbia River and Gorge. Oregon on the left; Washington on the right. (190811-57)
Download ImageCobble conglomerate (square)
Cobble conglomerate of pre-12 Ma Columbia River (Troutdale Formation), Oregon (190811-3)
Download ImageCascade Volcanoes and Waldo Lake, OR
View eastward of Cascade Volcanoes from Mount Hood to Bachelor Butte and Waldo Lake, Oregon (190615-14)
Download ImageSouth Falls, Silver Falls State Park, Oregon
South Falls spills over a flow of Wanapum Basalt at Silver Falls State Park, Oregon. The Alcove behind the falls formed by differential erosion of a recessive sedimentary rock unit between it and the underlying Grande Ronde Basalt. (190420-37)
Download ImageNew growth after forest fire, Oregon
New growth after forest fire, Oregon Cascades (170716-21)
Download ImageGlacier Snout, North Cascades, Washington
Layered ice at snout of Lower Curtis Glacier –on Mt. Shuksan, northern Washington (20908-15)
Download ImageTalus cone, Washington (vertical)
Accumulated rock fall deposits on talus cone, northern Washington (200908-8)
Download ImageTalus cone and peaks, Washington
Accumulated rock fall deposits on talus cone, northern Washington (200908-4)
Download Image
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