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Summary
DescriptionWhite River Badlands of South Dakota panorama.jpg |
(photos by James St. John; photo stitch by Mary Ellen St. John) The White River Badlands of South Dakota consist of a scenic landscape of differentially weathered and eroded, nonmarine sedimentary rocks of Tertiary age. The most scenic areas have been set aside as an American national park (Badlands). The simplified stratigraphic succession in Badlands National Park is: Sharps Formation (Oligocene) Brule Formation (Oligocene) Chadron Formation (Eocene) Chamberlain Pass Formation (Eocene) Fox Hills Formation (Cretaceous-Paleocene?) Pierre Shale (Cretaceous) The Brule and Chadron Formations make up the White River Group, which along with the overlying Sharps Formation, provide the principal scenery in the White River Badlands. Light-colored volcanic ash beds are present in the succession, as are numerous reddish-colored paleosol ("fossil soil") horizons. The Pierre Shale at the base of the exposed succession is a marine unit. The White River Group weathers and erodes relatively quickly into a rugged landscape with steep slopes, little to no soil, and little to no vegetation. These are the characteristics of badlands topography - "bad" referring to its unsuitability for farming. Nonmarine fossils are relatively common in the White River Group - principally fossil mammals and other vertebrates. Fossils in the Chadron Formation indicate a swampy, near-sea level environment. The overling Brule Formation produces fossils consistent with a grassy prairie environment. The transition from low-elevation swamp to higher-elevation prairie in this area coincides with the uplift of the Rocky Mountains during the late stages of the Laramide Orogeny. Erosion rates in the White River Badlands indicate that the landscape started to appear about half-a-million years ago and that it will disappear about half-a-million years into the future. The landscape has about a one million year lifespan. Online pub. covering the geology of Badlands National Park: 3dparks.wr.usgs.gov/badl/images/of03-35.pdf |
Date | |
Source | Differentially eroded siliciclastic sedimentary rocks (White River Group, Tertiary; White River Badlands, Badlands National Park, South Dakota, USA) 2 |
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@N05/36981860770. It was reviewed on 24 September 2017 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
24 September 2017
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21 September 2017
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 02:18, 24 September 2017 | ![]() | 4,331 × 1,417 (4.1 MB) | Tillman | Transferred from Flickr via Flickr2Commons |
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Width | 4,331 px |
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Height | 1,879 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 200 dpi |
Vertical resolution | 200 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 23:42, 21 September 2017 |
Exif version | 2.21 |
Color space | sRGB |
Unique ID of original document | F7B040AF1EB4F9A172844DE92640C1B8 |
Date and time of digitizing | 18:16, 15 September 2017 |
Date metadata was last modified | 19:42, 21 September 2017 |
IIM version | 32,767 |