Devils Tower and talus, Wyoming (vertical)
Devils Tower, Wyoming and talus shed off the monolith. Devils Tower is an Eocene volcanic neck of phonolite. Note how the columnar jointing becomes more irregular towards the top. (250824-146)
Download ImageFaulted monocline, Bighorn Mts, WY
Faulted monocline, Bighorn Mountains, Wyoming. Archean granitic basement rock in foregound. (250824-144).
Download ImageBeartooth Butte, Wyoming
Beartooth Butte: Cambrian through Devonian sedimentary rock on top Archean basement rock (in foreground) (250824-134)
Download ImagePhonolite porphyry, Devils Tower, WY
Close-up view of volcanic rock (Phonolite porphyry) of Devils Tower. Devils Tower National Monument, Wyoming (250824-107)
Download ImageDevils Tower, Wyoming (vertical)
Devils Tower, Wyoming, an Eocene volcanic neck of phonolite. Note how the columnar jointing becomes more irregular towards the top.
Download ImageColumns 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)
Download ImageDevils 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)
Download ImageDevils Tower, Wyoming
Devils Tower, Wyoming, an Eocene volcanic neck of phonolite. Note the columnar jointing, which becomes more irregular towards the top.
Download ImageDevils 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)
Download ImageDevils Tower, Wyoming
Devils Tower, Wyoming, an Eocene volcanic neck of phonolite. Note the columnar jointing, which becomes more irregular towards the top. (250824-85)
Download ImageWasatch Fm., Powder River Basin, WY
Eocene Wasatch Formation, Powder River Basin, Wyoming (250824-79)
Download ImageBighorn Dolomite, Bighorn Mts, WY
Steamboat Point, made of Ordovician Bighorn Dolomite. Bighorn Mountains, Wyoming (250824-76)
Download ImageFaulted monocline, Wyoming
Faulted monocline, Bighorn Mountains, Wyoming. (250824-67).
Download ImageFlatirons 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)
Download ImageBighorn 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)
Download ImageE. edge of Bighorn Basin, WY
East edge of the Bighorn Basin, Wyoming. Bighorn Mountains in the background. Road is US 14. (250824-57)
Download ImageBighorn Mtns monocline, WY (pan)
Bighorn Mountains monocline as seen along the east edge of the Bighorn Basin near Greybull on US 14. (250824-54)
Download ImageHeart Mountain Detachment, Wyoming
Heart Mountain Detachment fault: Eocene volcanic rock of the Absaroka Volcanics over Paleozoic rock. (250824-47)
Download ImageHeart Mountain Detachment, Wyoming
Heart Mountain Detachment fault: Eocene volcanic rocks over Paleozoic rock. (250824-46)
Download ImageArchean gneiss on the Beartooth Plateau, Wyoming (250824-31)
Archean gneiss on the Beartooth Plateau, Wyoming (250824-31)
Download ImageRipples on Cambrian sandstone, Vermont
Ripplemarks on Quartzite of the Cambrian Monkton Formation, Burlington, Vermont. Winooski River in background. (250914-18)
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