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Hot Spring and sinter, Yellowstone NP, WY
Hot Spring and sinter, Yellowstone National Park, Wyoming (170527-63)
Download ImageFishing Cone Geyser and Yellowstone Lake, WY
Fishing Cone Geyser, marked by a build-up of travertine, and Yellowstone Lake, Yellowstone National Park, Wyoming. (170527-51)
Download ImageTeton Range, Wyoming (Pan)
High Tetons, Grand Teton National Park, Wyoming. Left (south) to right (north): South Teton, Middle Teton, Grand Teton, Mt. Owen, Teewinot Mountain. Note the several glacial valleys and cirques. (170527-23)
Download ImageGrand Teton and Mt. Owen, Wyoming.
Grand Teton and Mt. Owen, Grand Teton National Park, Wyoming. Teton Glacier and cirque lies between them. (170527-15)
Download ImageGrand Teton, Wyoming (vertical)
Grand Teton, Grand Teton National Park, Wyoming. Grand Teton is made mostly of Precambrian granitic rock. (170527-14)
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Pegmatite dike intruding faulted gneiss
Pegmatite dike intruding faulted gneiss (note offset of gneiss) 170526-20.
Download ImagePegmatite dike intruding faulted gneiss
Pegmatite dike intruding faulted gneiss (note offset of gneiss) 170526-18.
Download Imagemeandering stream, Wyoming
meandering stream, Wyoming showing tight meander bends –upper reaches of the Wind River. (170525-28).
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Great Unconformity, Colorado
Nonconformity between Cambrian Sawatch Sandstone and Precambrian Pikes Peak Granite -the “Great Unconformity” Manitou Springs, Colorado. (170523-17)
Download ImageMonocline, NE Utah (Pan)
Monocline, defined by Permian Weber Sandstone, which forms the flatirons along the front of the mountain, NE Utah. (170519-31).
Download ImageDifferential erosion: a hogback, Utah
Hogback ridge, held up by resistant sandstone of the Cretaceous Dakota Formation. Dinosaur National Monument, Utah. (170519-25)
Download ImageDifferential erosion: a hogback, Utah
Hogback ridge, held up by resistant sandstone of the Cretaceous Dakota Formation. Dinosaur National Monument, Utah. (170519-25)
Download ImageDifferential erosion of sandstone vs shale, Utah.
The sandstone beds are more resistant to weathering and erosion than the red shale beds. (170519-3)
Download ImageRhyolite exposed at Shoshone Falls, Idaho
Rhyolite of the Twin Falls volcanic field -a 10 Ma caldera of the Yellowstone Hot Spot– exposed at Shoshone Falls, Idaho. Basalt of the Snake River Plain forms the cliffs on the skyline. (170518-38)
Download ImageRhyolite exposed at Shoshone Falls, Idaho
Rhyolite of the Twin Falls volcanic field -a 10 Ma caldera of the Yellowstone Hot Spot– exposed at Shoshone Falls, Idaho. Basalt of the Snake River Plain forms the cliffs on the skyline. (170518-33)
Download ImageOrtley Thrust and Columbia River, WA (Pan)
Ortley Thrust and Columbia River, Washington. The fault places older Grande Ronde basalt on the right (east) over the younger Wanapum Basalt –both of the Columbia River Basalt Group. (170517-54)
Download ImageGlacial erratics on N. Olympic coast, WA (square)
Out-of-place granitic boulders-glacial erratics- on the northern Olympic coast, Washington. Bedrock is basalt of Crescent Formation. (150912-11c)
Download ImageGhost Forest near Baycenter, WA
Ghost Forest exposed at low tide in intertidal zone near Baycenter, Washington. Uplifted marine terrace on left. (160430-52)
Download ImageGhost Forest near Baycenter, WA
Ghost Forest exposed at low tide in intertidal zone near Baycenter, Washington. (160430-46)
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