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Stromatalites from the Proterozoic Chuar Group, AZ
Stromatalites from the Proterozoic Chuar Group, Grand Canyon National Park, Arizona (260518-101)
Download ImageTravertine and Little Colo River, AZ
Travertine-coated rock, Little Colorado River, Grand Canyon National Park, Arizona. Rocks in background show the Paleozoic section from the Muav Limestone up through the Kaibab (260518-82)
Download ImageCross bedding, Tapeats SS, AZ
Cross-bedding in Cambrian Tapeats Sandstone, Grand Canyon National Park, Arizona (260518-74)
Download Imageripple cross-laminations in silt
Ripple cross-laminations in recently deposited silt, Grand Canyon National Park, Arizona. (260518-45)
Download Image260517-134
Ancestral Puebloan graineries at Nankoweep and Colorado River, Grand Canyon National Park, Arizona. (260517-134)
Download ImageColorado River and Pz strat (vertical)
Colorado River and Paleozoic stratigraphy from Muav Limestone up through the Kaibab Limestone, Grand Canyon National Park, Arizona. (260517-1245)
Download ImageColorado River and Pz stratigraphy
Colorado River and Paleozoic stratigraphy from Muav Limestone up through the Kaibab Limestone, Grand Canyon National Park, Arizona. (260517-124)
Download ImageAlcove and groundwater sapping, AZ
Alcove along the Colorado River, formed by groundwater sapping in the Cambrian Muav Limestone just below the Mississippian Redwall Lmestone, Grand Canyon National Park, Arizona. The contact between the two is a disconformity (260517-98)
Download ImageDissolution of limestone, AZ
Karst. Dissolution of Mississippian Redwall Limestone by groundwater, Grand Canyon National Park, Arizona. (260517-80)
Download ImageChert nodules in limestone, AZ
Chert nodules in Mississippian Redwall Limestone, possibly accumulations of sponge spicules, Grand Canyon National Park, Arizona. 260517-74)
Download ImageMississippian baculites cephalopod.
Mississippian Baculite cephalopod ammonite in Redwall Limestone, Grand Canyon National Park, Arizona. (260517-73)
Download ImageGroundwater seeps along bedding plane, AZ
Groundwater seeps along bedding surface in Mississippian Redwall Limestone, Grand Canyon National Park, Arizona. (260517-72)
Download ImageColorado River, Grand Cyn, AZ
Colorado River and Paleozoic rock at Redwall Cavern. The overhanging cliffs are Mississippian Redwall Limestone. Grand Canyon National Park, Arizona. (250517-65)
Download ImageDissolution of limestone, AZ
Karst. Dissolution of Mississippian Redwall Limestone by groundwater, Grand Canyon National Park, Arizona. (260517-20)
Download ImagePermian Synapsid Tracks in sandstone, AZ
Synapsid Tracks in Permian Coconino Sandstone. Grand Canyon National Park, Arizona. (260516-23)
Download ImagePermian Synapsid Tracks in sandstone, AZ
Synapsid Tracks in Permian Coconino Sandstone. Grand Canyon National Park, Arizona. (260516-19)
Download ImagePermian eolian cross-beds, AZ
Eolian cross-bedding in Permian Coconino Sandstone, Grand Canyon National Park, Arizona. (260516-13)
Download ImageDevils 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 Image
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