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5332 images found

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Buttress Unconformity, northern Arizona

In buttress unconformities, the younger material
is deposited against the older material, resulting in the apparent truncation of the younger rock. On closer inspection, however, one can see erosional features along the contact to indicate its depositional
origin. (ID SrU-25)

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Sandstone Arch, SE Utah

Arch (Wilson Arch) of Jurassic Navajo Sandstone, SE Utah. (ID WE-04)

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Sandstone Fins

Sandstone fins–from erosion along joint surfaces, Arches NP, Utah (ID WE-02)

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Flowing pahoehoe, Hawaii. (vertical)

Flowing pahoehoe lava flow, Hawaii. Profile of Kilauea shield volcano in background. (ID: Vc-37)

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Sandstone Arch, Utah

Delicate Arch, made of Jurassic Navajo Sandstone. Arches National Park, Utah. (ID # WE-01)

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Angular unconformity, Death Valley, CA.

This unconformity shows 4 Ma Funeral basalt overlying Artist Drive Fm (left) faulted against tilted Furnace Creek Fm (right). The 1920’s era mining camp of Ryan sits on the hills just below the unconformity. This area has been the site of underground and strip mining of borate minerals. (Image ID# SrU-23)

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Angular unconformity, Kyrgyzstan

Angular unconformity, Tien Shan Mtns., Kyrgyzstan. (ID# SrU-18)

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Nonconformity, Colorado

Nonconformity, Front Range, CO. Pennsylvanian Fountain Formation overlies basement gneiss at Red Rocks State Park (ID #SrU-22)

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Nonconformity, Utah

Precambrian-Cambrian Nonconformity, exposed in a tilted sequence, Wasatch Mtns., Utah. (ID#SrU-15)

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Faulted angular unconformity (pan)

Faulted angular unconformity between Pliocene basalt and folded, faulted, and intruded Paleozoic rock, SE California. Granitic rock forms the left side of the exposure (ID#SrU-19)

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