File:Sandstone-coal-tonsteins (Ericson Sandstone over Rock Springs Formation, Upper Cretaceous; hairpin curve roadcut along Superior Cutoff Road, east of Superior, Wyoming, USA) 8 (48961374001).jpg
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| Description |
Sandstone-coal-tonsteins in the Cretaceous of Wyoming, USA. The outcrop seen here consists of Upper Cretaceous sedimentary rocks near the town of Superior, Wyoming. The unit at top is a quartzose sandstone of the basal Ericson Sandstone. Below the Ericson Sandstone is the uppermost Rock Springs Formation. The black layers are coals (hand samples indicate that these are apparently sub-bituminous coals) - this is the Rock Springs No. 5 Coal Bed. The thin, whitish-colored beds in the coal interval are soft claystones that were originally volcanic ash beds. They have been chemically altered as a result of deposition and burial in the acidic, reducing conditions of a coal swamp environment. Such altered volcanic ash beds are called tonsteins. Stratigraphy: lower Ericson Sandstone over upper Rock Springs Formation, Upper Cretaceous Locality: hairpin curve roadcut along Superior Cutoff Road, northeastern side of Horse Thief Canyon, east of the town of Superior, central Sweetwater County, southwestern Wyoming, USA (41° 45' 58.04" North latitude, 108° 56' 22.36" West longitude) |
| Date | |
| Source | Sandstone-coal-tonsteins (Ericson Sandstone over Rock Springs Formation, Upper Cretaceous; hairpin curve roadcut along Superior Cutoff Road, east of Superior, Wyoming, USA) 8 |
| 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@N05/48961374001 (archive). It was reviewed on 4 November 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 | 14:19, 4 November 2019 | | 4,288 × 2,848 (7.63 MB) | Ainz Ooal Gown (talk | contribs) | Transferred from Flickr via #flickr2commons |
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