File:Otter Creek & gravel bar of Baraboo Quartzite clasts (Baxter Hollow, South Range of the Baraboo Ranges, Wisconsin, USA) 3.jpg
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| Description |
English: Otter Creek in the South Range of the Baraboo Ranges of Wisconsin, USA.
The gravel bars in this creek have abundant, large quartzite clasts derived from nearby outcrops of Baraboo Quartzite. The Baraboo Ranges of southern Wisconsin are dominated by this hard, erosion-resistant Precambrian metamorphic unit. These rocks were originally marine sandstones and have been subjected to metamorphism and structural folding. Original sedimentary structures are preserved, such as cross-bedding and ripple marks. Baraboo Quartzites vary in color from pinkish to dark reddish to grayish. During metamorphism, quartz overgrowths formed over the original quartz sand grains. Long-term, modern weathering can result in original sand grains being released. This unit has economic significance - it has been quarried historically and in modern times. The quartzite is broken down into gravel-sized pieces for use as railroad ballast and erosion-control rip-rap. Stratigraphy: Baraboo Quartzite, upper Paleoproterozoic, ~1.7 Ga Locality: Baxter Hollow (a little downstream of bridge over Otter Creek), South Range of the Baraboo Ranges, southeastern Sauk County, southern Wisconsin, USA |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/18658260148/ |
| 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@N05/18658260148. It was reviewed on 3 December 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 | |
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| current | 19:55, 3 December 2020 | | 4,000 × 3,000 (3.61 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/18658260148/ with UploadWizard |
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