Image:Canyon de Chelly2.jpg
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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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This image is a work of a United States Geological Survey employee, taken or made during the course of the person's official duties. As a work of the United States Government, the image is in the public domain. For more information, see the USGS copyright policy. See Wikipedia:Public domain and Wikipedia:Copyrights for more details. |  |
Canyon de Chelly National Monument, Arizona. Spider Rock. Digital File:cdc1605.jpg
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| Date/Time | Dimensions | User | Comment | |
|---|---|---|---|---|
| current | 03:38, 4 September 2005 | 800×600 (198 KB) | Hydrargyrum (Talk | contribs) | (Spider Rock, Canyon de Chelly {{PD-USGov-Interior-USGS}} Canyon de Chelly National Monument, Arizona. Spider Rock. Digital File:cdc1605.jpg ) |
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| Camera manufacturer | SONY |
|---|---|
| Camera model | MVC-CD500 |
| Exposure time | 1/250 sec (0.004) |
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| Date and time of data generation | 13:54, 9 August 2004 |
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| Horizontal resolution | 72 dpi |
| Vertical resolution | 72 dpi |
| Software used | Adobe Photoshop 7.0 |
| File change date and time | 18:40, 20 September 2004 |
| Y and C positioning | 2 |
| Exposure Program | Normal program |
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| Date and time of digitizing | 13:54, 9 August 2004 |
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| Exposure bias | 0 |
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| Metering mode | Pattern |
| Light source | Unknown |
| Flash | 0 |
| Color space | sRGB |
| Custom image processing | Normal process |
| Exposure mode | Auto exposure |
| White balance | Auto white balance |
| Scene capture type | Standard |
