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Devils Tower, Wyoming (vertical)

Devils Tower, Wyoming, an Eocene volcanic neck of phonolite. Note how the columnar jointing becomes more irregular towards the top.

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Columns at Devils Tower, WY (vertical)

Columnar jointing at Devils Tower, Wyoming, an Eocene volcanic neck of phonolite. Note how the columnar jointing becomes more irregular towards the top. (250624-96)

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Devils Tower, Wyoming (vertical)

Devils Tower, Wyoming, an Eocene volcanic neck of phonolite. Note how the columnar jointing becomes more irregular towards the top. (250824-92)

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Devils Tower, Wyoming

Devils Tower, Wyoming, an Eocene volcanic neck of phonolite. Note the columnar jointing, which becomes more irregular towards the top.

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Devils Tower, Wyoming (vertical)

Devils Tower, Wyoming, an Eocene volcanic neck of phonolite. Note the columnar jointing, which becomes more irregular towards the top. (250824-86)

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Devils Tower, Wyoming

Devils Tower, Wyoming, an Eocene volcanic neck of phonolite. Note the columnar jointing, which becomes more irregular towards the top. (250824-85)

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Wasatch Fm., Powder River Basin, WY

Eocene Wasatch Formation, Powder River Basin, Wyoming (250824-79)

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Bighorn Dolomite, Bighorn Mts, WY

Steamboat Point, made of Ordovician Bighorn Dolomite. Bighorn Mountains, Wyoming (250824-76)

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Faulted monocline, Wyoming

Faulted monocline, Bighorn Mountains, Wyoming. (250824-67).

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Flatirons at front of Bighorn Range, WY

Flatirons and front of monocline at the west front of the Bighorn Mountains, Wyoming. Gently dipping red rock in the foreground is part of the Triassic Chugwater Formation. (250824-59)

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Bighorn Mtns monocline, Wyoming.

West front of monocline of the Bighorn Mountains, Wyoming. Flat-lying red rocks in the foreground are the Triassic Chugwater Formation (250824-58)

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E. edge of Bighorn Basin, WY

East edge of the Bighorn Basin, Wyoming. Bighorn Mountains in the background. Road is US 14. (250824-57)

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Bighorn Mtns monocline, WY (pan)

Bighorn Mountains monocline as seen along the east edge of the Bighorn Basin near Greybull on US 14. (250824-54)

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Heart Mountain Detachment, Wyoming

Heart Mountain Detachment fault: Eocene volcanic rock of the Absaroka Volcanics over Paleozoic rock. (250824-47)

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Heart Mountain Detachment, Wyoming

Heart Mountain Detachment fault: Eocene volcanic rocks over Paleozoic rock. (250824-46)

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Archean gneiss on the Beartooth Plateau, Wyoming (250824-31)

Archean gneiss on the Beartooth Plateau, Wyoming (250824-31)

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Ripples on Cambrian sandstone, Vermont

Ripplemarks on Quartzite of the Cambrian Monkton Formation, Burlington, Vermont. Winooski River in background. (250914-18)

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Black limestone, New York

Black Limestone. Onandanga Limestone, near Katsbaan, New York (IP2510-0957)

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Lake Bonneville shorelines, N. Utah

Shorelines of Glacial Lake Bonneville, northern Utah (251019-01)

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Wineglass Canyon, Utah

Steed Canyon, a wineglass canyon suggestive of recent uplift, and Bountiful Peak of the Wasatch Mountains, Utah. (251018-70)

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Wetlands and Wasatch Mountains, Utah

Wetlands along edge of Great Salt Lake, Utah. Steed Canyon, a large wineglass canyon, and Bountiful Peak of the Wasatch Range, form the backdrop. (251018-67)

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