File:Eagle Collapse Center & Sawatch Range (western Colorado, USA) 1.jpg
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English: The outcrops in the foreground are part of the Eagle Valley Evaporite, a Middle Pennsylvanian unit dominated by rock salt (halite, NaCl), rock gypsum (CaSO4·2H2O), and rock anhydrite (CaSO4). These three rock types form by evaporation of seawater and the precipitation of dissolved minerals. With deep burial, evaporites tend to engage in upward, solid-state flow. A large area around the town of Gypsum, Colorado is extensively deformed by upward movement, dissolution, and collapse of various evaporite rocks - this is the Eagle Collapse Center, which covers about 2,500 square kilometers. Evaporite rock movement and deformation occurred principally in the late Cenozoic.
The mountain range in the background is the Sawatch Range, which is part of the Southern Rocky Mountains Physiographic Province. These mountains formed during the Laramide Orogeny, a Late Cretaceous to Tertiary mountain building event. Locality: view from ~north of the town of Gypsum, western Eagle County, northwest-central Colorado, USA Info. synthesized from: Chronic & Williams (2002) - Roadside Geology of Colorado. Lidke et al. (2002) - Geological Society of America Abstracts with Programs 34(6): 288. Mallory (1971) - The Eagle Valley Evaporite, northwest Colorado - a regional synthesis. United States Geological Survey Bulletin 1311-E. 37 pp. |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/51152597815/ |
| 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@N05/51152597815. It was reviewed on 6 May 2021 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 | 19:20, 6 May 2021 | | 4,000 × 1,934 (4.87 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/51152597815/ with UploadWizard |
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