File:Shinarump Conglomerate (Upper Triassic; Canyon de Chelly, Arizona, USA) 1.jpg
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| Description |
English: Conglomerates & sandstones in the Permo-Triassic of Arizona, USA.
These are rimrocks atop a sheer canyon wall in Arizona. The light-colored rock at the bottom of the photo is Permian-aged De Chelly Sandstone (pronounced "De Shay"). Above the De Chelly is the Shinarump Conglomerate, an Upper Triassic, fluvial, coarse-grained siliciclastic unit. It consists of quartzose sandstones, pebbly sandstones, and lithic conglomerates. The De Chelly-Shinarump contact is a significant unconformity - an erosion surface representing missing time. There are several types of unconformities - this is a disconformity, which has sedimentary rocks over sedimentary rocks, with parallel bedding geometries ("flat over flat"). Don't let the tilted bedding in the lower lighter-colored rocks fool you - this is not an angular unconformity. The tilted beds are cross beds, which form in a one-direction current by wind or water. Stratigraphy: Shinarump Conglomerate Member, lower Chinle Formation, Norian Stage, Upper Triassic Locality: view from Antelope House overlook (Navajo Fortress overlook), northern rim of "Canyon del Muerto" (= Canyon of the Dead), Canyon de Chelly National Monument, northeastern Arizona, USA |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/51946139732/ |
| Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/51946139732. It was reviewed on 22 March 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 13:50, 22 March 2022 | | 3,008 × 2,000 (5.25 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/51946139732/ with UploadWizard |
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