File:Wanakah Formation (Middle Jurassic; roadcut near Artists Point, Colorado National Monument, Colorado, USA) 1 (23644124619).jpg
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Summary
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| Description |
Mudshales in the Jurassic 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 greenish-gray and reddish-colored rocks shown above are mudshales of the Middle Jurassic Wanakah Formation (formerly known as the Summerville Formation). Some weathering-resistant siltstone and sandstone interbeds are also present. The Wanakah Formation is mostly nonmarine, but some marginal marine beds have been identified. Relatively few fossils have been found in the Wanakah Formation of western Colorado and eastern Utah, but include bivalves, ostracods, fish, and trace fossils. Locality: roadcut along Rim Rock Road next to Artists Point overlook, Colorado National Monument, southwest of the town of Grand Junction, west-central Mesa County, far-western Colorado, USA |
| Date | |
| Source | Wanakah Formation (Middle Jurassic; roadcut near Artists Point, Colorado National Monument, Colorado, USA) 1 |
| 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@N05/23644124619 (archive). It was reviewed on 6 December 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 | |
|---|---|---|---|---|---|
| current | 04:00, 6 December 2019 | | 2,000 × 3,008 (3.05 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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