File:Popcorn weathering (Big Blue Bentonite, Sentinel Butte Formation, Upper Paleocene; Coal Vein Trail, Roosevelt National Park, Little Missouri Badlands, North Dakota, USA) 11.jpg
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Summary
| Description |
English: Popcorn weathering forms in smectite clay-rich deposits. This slightly bluish-gray material is a weathered bentonite horizon (= volcanic ash deposit). 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. Surficial, popcorn-shaped structures form with repeated wetting & drying of some smectitic stratigraphic horizons.
Stratigraphy: Big Blue Bentonite (Big Blue Bed), Sentinel Butte Formation, Upper Paleocene Locality: Coal Vein Trail, South Unit of Roosevelt National Park, Little Missouri Badlands, western North Dakota, USA |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/44482923435/ |
| 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@N05/44482923435. It was reviewed on 22 October 2020 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 | 18:36, 22 October 2020 | | 3,008 × 2,000 (5.22 MB) | Ser Amantio di Nicolao | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/44482923435/ with UploadWizard |
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