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| Keywords: Canyon de Chelly2.jpg en 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 2004-08-09 13 54 37 http //pubs er usgs gov/ United States Geological Survey USGS Digital File cdc1605 jpg<br>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 USGS employee PD work of US government PD-USGov Uploaded with UploadWizard Canyon de Chelly National Monument Colorado Plateau Navajo section Colorado Plateau region of Arizona Defiance Plateau De Chelly Sandstone Cutler Formation Shinarump Conglomerate Chinle Formation Chinle Formation in Arizona Supai Group 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 | ||||
