File:Baraboo Quartzite (upper Paleoproterozoic, ~1.7 Ga; Rt. 12 roadcut, South Range, Baraboo Ranges, Wisconsin, USA) 6 (18622103899).jpg
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| Description |
Quartzite in the Precambrian of Wisconsin, USA. The Baraboo Ranges of southern Wisconsin are dominated by a hard, erosion-resistant Precambrian metamorphic unit called the Baraboo Quartzite. 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: roadcut on the eastern side of Rt. 12 in the South Range of the Baraboo Ranges, north of the town of Bluffview, southeastern Sauk County, southern Wisconsin, USA (43° 23’ 31.91” North, 89° 46’ 12.12” West) |
| Date | |
| Source | Baraboo Quartzite (upper Paleoproterozoic, ~1.7 Ga; Rt. 12 roadcut, South Range, Baraboo Ranges, Wisconsin, USA) 6 |
| 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@N05/18622103899 (archive). It was reviewed on 22 October 2019 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 | 05:43, 22 October 2019 | | 3,671 × 2,644 (3.5 MB) | Rudolphous (talk | contribs) | Transferred from Flickr via #flickr2commons |
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