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File:Big Blue Bentonite (Sentinel Butte Formation, Upper Paleocene; Coal Vein Trail, Roosevelt National Park, Little Missouri Badlands, North Dakota, USA) 5.jpg

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English: This bluish-gray horizon is a weathered bentonite bed (= 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.

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@N05/44673146794/
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@N05/44673146794. 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.

22 October 2020

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28 August 2008

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current18:35, 22 October 2020Thumbnail for version as of 18:35, 22 October 20203,006 × 1,725 (4.9 MB)Ser Amantio di NicolaoUploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/44673146794/ with UploadWizard

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