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File:Cannonball concretions (Sentinel Butte Formation, Upper Paleocene; Little Missouri Badlands, North Dakota, USA) 13.jpg
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Original file (3,008 × 2,000 pixels, file size: 5.59 MB, MIME type: image/jpeg)
Summary
| Description |
English: Concretions are post-depositional structures found in some sedimentary successions, usually in shales. They vary in mineralogy, size, and shape, but often have slightly flattened spheroidal shapes. They form by post-depositional mineralization around some nucleus (e.g., a rock fragment or fossil fragment).
Stratigraphy: Sentinel Butte Formation, Upper Paleocene Locality: North Unit of Roosevelt National Park, Little Missouri Badlands, western North Dakota, USA |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/51866405915/ |
| Author | James St. John |
Licensing
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@N05/51866405915. It was reviewed on 17 February 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 17:36, 17 February 2022 | | 3,008 × 2,000 (5.59 MB) | Ser Amantio di Nicolao | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/51866405915/ with UploadWizard |
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