File:Erosion control blocks of Sioux Quartzite (Paleoproterozoic, 1.65-1.70 Ga; Interstate 90 at the Missouri River, Oacoma, South Dakota, USA).jpg
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DescriptionErosion control blocks of Sioux Quartzite (Paleoproterozoic, 1.65-1.70 Ga; Interstate 90 at the Missouri River, Oacoma, South Dakota, USA).jpg |
English: Erosion control blocks of Sioux Quartzite (Precambrian) along Interstate 90 at the Missouri River, Oacoma, South Dakota, USA.
Extensive outcrops of pinkish, Paleoproterozoic-aged quartzites are present at Falls Park along the Big Sioux River in the city of Sioux Falls, southeastern South Dakota, USA. The quartzites here have nicely water-worn, sculpted surfaces with good, fluvially abraded polish in places. These rocks are part of the Sioux Quartzite (Paleoproterozoic, 1.65-1.70 Ga). Despite being subjected to regional metamorphism, this unit’s original sedimentary features, such as horizontal stratification and ripple marks, are still preserved. The Sioux Quartzite is a famous 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 NE-SW trending series of paleotopographic highs & depressions known as the Transcontinental Arch, which extends from Arizona to Minnesota (see Carlson, 1999). The Sioux Quartzite has been and still is quarried in the town of Sioux Falls. Material from these quarries is used as road gravel, sidewalk and paving gravel, and erosion control blocks (see above photo for an example of the latter). Stratigraphy: Sioux Quartzite, upper Paleoproterozoic, 1.65-1.70 Ga Locality: Interstate 90 at the Missouri River, Oacoma, 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. |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/8483487977/ |
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@N05/8483487977. It was reviewed on 7 August 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
7 August 2020
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current | 02:41, 7 August 2020 | 3,604 × 1,802 (3.08 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/8483487977/ with UploadWizard |
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Exposure time | 1/320 sec (0.003125) |
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Date and time of data generation | 10:52, 1 July 2012 |
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File change date and time | 10:52, 1 July 2012 |
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Exif version | 2.21 |
Date and time of digitizing | 10:52, 1 July 2012 |
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