File:Spider Rock, Canyon de Chelly.jpg
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English: Spider Rock, Canyon de Chelly. Spider Rock is a pinnacle in Canyon de Chelly. The oldest (and lowest) sedimentary rock formation in the canyon is the Supai Formation, deposited in Pennsylvanian time (about 280 million years ago) in the era before dinosaurs when the Colorado Plateau region was a hot and humid coastal plain. Today, these dominantly reddish-brown mudstone layers are exposed along the base of the canyon. The massive, high cliffs that form the walls of the canyon are De Chelley Sandstone. The De Chelley Sandstone consists of sand deposited in dunes in a subtropical to arid environment in Early Triassic time (about 250 to 230 million years ago). The caprock along the canyon consists of a comparatively thin unit of Shinarump Conglomerate. The Shinarump Conglomerate of the lower Chinle Formation is of latest Triassic to Jurassic age (around 200 million years old) and consists of stream deposited sand and gravel. Younger strata that once covered the region have long since eroded away. The canyon is carved into the Defiance Plateau, a broad, upland surface covered with juniper and piñon pine in northwestern Arizona. |
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United States Geological Survey (USGS) Digital File:cdc1605.jpg This unmodified image was originally uploaded to the English Wikipedia on 4 September 2005, 03:38 UTC by Hydrargyrum and copied from the English Wikipedia on 29 June 2011 by Hydrargyrum. It has been removed from USGS Web servers since the original upload date. |
| Author | USGS employee |
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PD work of US government |
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This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code.
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da:Canyon de Chelly de:Canyon de Chelly National Monument en:Canyon de Chelly National Monument es:Cañón de Chelly fa:یادبود ملی کنیون د شلی fr:Monument national du Canyon de Chelly it:Canyon de Chelly lt:De Chelly Kanjono nacionalinis paminklas nl:Nationaal monument Canyon de Chelly nv:Tséyiʼ (Chʼínílį́įgiʼígíí) pl:Kanion De Chelly ru:Каньон Де Шейи sv:Canyon de Chelly nationalmonument
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 20:44, 29 June 2011 | | 800 × 600 (198 KB) | Hydrargyrum (talk | contribs) |
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