File:Black Canyon Schist (Paleoproterozoic, 1.759 Ga; No Thoroughfare Canyon, Colorado National Monument, Colorado, USA) 3 (23570940679).jpg
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| Description |
Schist in the Precambrian of Colorado, USA. Colorado National Monument is a colorful and scenic park just southwest of the town of Grand Junction in western Colorado, USA. It's located in the northeastern part of the Colorado Plateau Physiographic Province, a large section of continental crust that was significant uplifted during the Cenozoic. The rocks in the park are gently folded into a large monocline that has been erosionally dissected into a series of dramatic canyons. The above photo shows outcrops of the oldest rocks in the park. This is Precambrian basement, consisting of blackish-colored schists. Schist is a foliated, coarsely-crystalline, intermediate- to high-grade metamorphic rock. It usually forms by intense alteration of phyllite (which was formerly slate, which was formerly shale). Geologic unit & age: Black Canyon Schist, late Paleoproterozoic, 1.759 Ga Locality: No Thoroughfare Canyon, southeastern Colorado National Monument, southwest of the town of Grand Junction, west-central Mesa County, far-western Colorado, USA |
| Date | |
| Source | Black Canyon Schist (Paleoproterozoic, 1.759 Ga; No Thoroughfare Canyon, Colorado National Monument, Colorado, USA) 3 |
| 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@N05/23570940679 (archive). It was reviewed on 22 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 05:52, 22 October 2019 | | 3,008 × 2,000 (3.12 MB) | Rudolphous (talk | contribs) | Transferred from Flickr via #flickr2commons |
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