File:Fountain Formation (Pennsylvanian-Permian; Red Rocks Park, west of Denver, Colorado, USA) 10.jpg
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| Description |
English: The Fountain Formation is a significant stratigraphic unit in the Upper Paleozoic of Colorado. It is about 900 meters thick at its greatest and consists of reddish-colored siliciclastics of Pennsylvanian to Permian age. The sediments were eroded from the Ancestral Rocky Mountains and deposited in ancient, terrestrial alluvial fans to nearshore marine fan deltas.
The outcrops seen here are in Red Rocks Park near Denver, Colorado. In general, the unit is composed of mixed siliciclastics, from shale to siltstone to sandstone to conglomerate. At this site, it includes sandstone, arkose, and conglomerate. The original source rocks were rich in quartz and potassium feldspar - in other words, granites. The reddish coloration is from iron oxide (hematite, Fe2O3). Stratigraphy: Fountain Formation, Pennsylvanian to Permian Locality: exposure in Red Rocks Park, west of Denver, north-central Colorado, USA |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/52540788935/ |
| 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@N05/52540788935. It was reviewed on 4 December 2022 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 | 17:40, 4 December 2022 | | 3,008 × 2,000 (3.43 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/52540788935/ with UploadWizard |
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