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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)
Download ImageGhost Forest near Baycenter, WA
Ghost Forest exposed at low tide in intertidal zone near Baycenter, Washington. (160429-38)
Download ImageSea cliffs, Kealakekua Bay, Hawaii (Pan)
Sea cliffs of basalt lava flows from Mauna Loa Shield Volcano, Kealakekua Bay, Hawaii. The cliffs originated as the headwall to a giant landslide. (170915s-10c)
Download ImageColonnade in basalt flow, Oregon
Looking upward at the colonnade in a basalt flow, near Warm Springs, Oregon –shows both cross-sectional and longitudinal views. (171007-40)
Download Imageincandescent glow from Kilauea caldera
Incandescent glow from lava in Kilauea caldera, Hawaii Volcanoes National Park. (170920-20)
Download ImageGlassy and vesicular fresh basaltic lava
Glassy and vesicular fresh basaltic lava. (170917s-43)
Download ImagePahoehoe basalt and spatter cone, Mauna Loa
Pahoehoe basalt and spatter cone, Mauna Loa volcano. Cinder cones in background. Hawaii Volcanoes National Park. (170917s-23)
Download ImagePahoehoe basalt and cinder cone, Mauna Loa
hikers on pahoehoe basalt flow; cinder cone in background. Hawaii Volcanoes National Park. (170917s-14)
Download ImageDiamond Head crater, Oahu, Hawaii
Aerial view of Diamond Head crater, Oahu, Hawaii. Fringing reef in foreground (170913s-10)
Download ImagePahoehoe basalt and Holei Pali, Hawaii
Pahoehoe basalt and Holei Pali, Hawaii Volcanoes National Park. (170920-124)
Download ImageSurface and cross-sectional view of lava
Surface and cross-sectional view of basaltic lava, Hawaii Volcanoes National Park. (170920-111)
Download Image
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