File:Otter Creek (Baxter Hollow, South Range of the Baraboo Ranges, Wisconsin, USA) (18848662191).jpg
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| Description |
Otter Creek in the South Range of the Baraboo Ranges of Wisconsin, USA. (3 June 2015) The coarse-grained gravel in this creek is 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 (immediately downstream of bridge over Otter Creek), South Range of the Baraboo Ranges, southeastern Sauk County, southern Wisconsin, USA (43° 23' 06.64" North, 89° 47' 55.43" West) |
| Date | |
| Source | Otter Creek (Baxter Hollow, South Range of the Baraboo Ranges, Wisconsin, USA) |
| 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@N05/18848662191 (archive). It was reviewed on 28 January 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 | 02:01, 28 January 2020 | | 3,995 × 2,286 (6.8 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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