File:Tonstein samples (Rock Springs Formation, Upper Cretaceous; hairpin curve roadcut along Superior Cutoff Road, east of Superior, Wyoming, USA) 1 (48933402041).jpg
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| Description |
Tonsteins in the Cretaceous of Wyoming, USA. The whitish rocks are soft claystone samples 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: upper Rock Springs Formation, Campanian Stage, upper 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 | Tonstein samples (Rock Springs Formation, Upper Cretaceous; hairpin curve roadcut along Superior Cutoff Road, east of Superior, Wyoming, USA) 1 |
| Author | James St. John |
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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/48933402041. 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 (7.85 MB) | Ainz Ooal Gown (talk | contribs) | Transferred from Flickr via #flickr2commons |
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