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Fountain Formation outcrop, CO (vertical).
Pennsylvanian Fountain Formation outcrop, Colorado Springs, Colorado 201002-78)
Download ImageFountain Formation outcrop, Colorado.
Pennsylvanian Fountain Formation outcrop, Colorado Springs, CO (201002-76)
Download ImageDisconformity: Eocene over Paleocene. CO
Disconformity (near bottom of outcrop): Eocene Castle Rock Conglomerate over Paleocene Dawson Arkose. Note cross-bedding and large clasts of Wall Mountain Tuff in the conglomerate. Castle Rock, Colorado. (201002-66)
Download ImageDisconformity: Eocene over Paleocene. CO (vertical)
Disconformity: Eocene Castle Rock Conglomerate over Paleocene Dawson Arkose. Note large clasts of Wall Mountain Tuff in the conglomerate. Castle Rock, Colorado. (201002-65)
Download ImageDisconformity, closeup view, Colorado
Disconformity (near bottom of photo): Eocene Castle Rock Conglomerate over Paleocene Dawson Arkose. (201002-64)
Download ImageDisconformity: Eocene over Paleocene, Colorado
Disconformity (near bottom of photo): Eocene Castle Rock Conglomerate over Paleocene Dawson Arkose. Note cross-bedding and large clasts in the conglomerate. Castle Rock, Colorado. (201002-57)
Download ImageCastle Rock, Colorado
Castle Rock, Colorado and fallen block of Castle Rock conglomerate. Note clasts of Wall Mountain Tuff in left foreground. (201002-47)
Download ImageCoarse arkosic ss of Fountain Fm, CO
Coarse arkosic sandstone of Pennsylvanian Fountain Formation, Colorado (201002-33)
Download ImageGreat unconformity at Red Rocks, Colorado
Nonconformity between Pennsylvanian Fountain Formation and Precambrian granite at Red Rocks State Park, Colorado (201002-25)
Download ImageI-70 roadcut, Golden, Colorado
I-70 roadcut, exposing the Jurassic Morisson and Cretaceous Dakota Formations, Colorado (201002-17)
Download ImageCretaceous 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 Image
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