File:Big Blue Bentonite (Sentinel Butte Formation, Upper Paleocene; Little Missouri Badlands, North Dakota, USA) 20.jpg
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Summary
| Description |
English: The bluish-gray interval is a weathered bentonite bed (= volcanic ash horizon), interpreted as deposited in an ancient lake. Some of the silicate minerals in the bentonite have been altered to smectite clay (also known as montmorillonite). Smectite is famous for being a "swelling clay" - a significant volume expansion occurs when wet. After drying out, the clay shrinks.
Stratigraphy: Big Blue Bentonite (Big Blue Bed), 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@N05/51872778095/ |
| 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@N05/51872778095. 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. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 17:36, 17 February 2022 | | 3,008 × 2,000 (6.03 MB) | Ser Amantio di Nicolao | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/51872778095/ with UploadWizard |
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