File:Sioux Quartzite (Paleoproterozoic, 1.65-1.70 Ga; Dell Rapids, South Dakota, USA) 5.jpg
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English: Quartzite from the Precambrian of South Dakota, USA.
The bedrock in southeastern South Dakota includes outcrops of pinkish, Paleoproterozoic-aged quartzites. A famous locality is Falls Park along the Big Sioux River in the city of Sioux Falls, South Dakota. These rocks are part of the Sioux Quartzite, a 1.65 to 1.70 billion year old succession of metamorphosed sandstones. Despite the metamorphism, original sedimentary features such as horizontal stratification, cross-bedding, and ripple marks are still preserved. The Sioux Quartzite is an erosion-resistant unit in America’s midcontinent. It has formed a long-lived paleotopographic high since Precambrian times - the Sioux tectonic core. This high is part of a northeast-to-southwest trending series of paleotopographic highs & depressions known as the Transcontinental Arch, which extends from Arizona to Minnesota (see Carlson, 1999). Quarries of Sioux Quartzite occur in southeastern South Dakota and southwestern Minnesota. The rocks have been used as building stone, road gravel, sidewalk and paving gravel, and erosion control material. Stratigraphy: Sioux Quartzite, upper Paleoproterozoic, 1.65-1.70 Ga Locality: unrecorded / undisclosed site at or near the town of Dell Rapids (possibly from a quarry), southeastern South Dakota, USA Reference cited: Carlson (1999) - Transcontinental Arch - a pattern formed by rejuvenation of local features across central North America. Tectonophysics 305: 225-233. |
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| Source | https://www.flickr.com/photos/47445767@N05/53315883430/ |
| 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@N05/53315883430. It was reviewed on 7 November 2023 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 17:01, 7 November 2023 | | 3,140 × 1,778 (4.53 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/53315883430/ with UploadWizard |
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