File:Percussion marks in Sioux Quartzite (Paleoproterozoic, 1.65-1.70 Ga; Falls Park, Sioux Falls, South Dakota, USA) 8.jpg
![File:Percussion marks in Sioux Quartzite (Paleoproterozoic, 1.65-1.70 Ga; Falls Park, Sioux Falls, South Dakota, USA) 8.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/6/64/Percussion_marks_in_Sioux_Quartzite_%28Paleoproterozoic%2C_1.65-1.70_Ga%3B_Falls_Park%2C_Sioux_Falls%2C_South_Dakota%2C_USA%29_8.jpg/800px-Percussion_marks_in_Sioux_Quartzite_%28Paleoproterozoic%2C_1.65-1.70_Ga%3B_Falls_Park%2C_Sioux_Falls%2C_South_Dakota%2C_USA%29_8.jpg?20200807024124)
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[edit]DescriptionPercussion marks in Sioux Quartzite (Paleoproterozoic, 1.65-1.70 Ga; Falls Park, Sioux Falls, South Dakota, USA) 8.jpg |
English: Percussion marks in quartzite in the Precambrian of 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. The arcuate cracks in the rock shown above are percussion marks (percussion cracks; percussion cones). These features formed as a result of clast impacts during energetic flow in the Big Sioux River. Ant for scale. Stratigraphy: Sioux Quartzite, upper Paleoproterozoic, 1.65-1.70 Ga Locality: Falls Park, near Sioux Falls along the Big Sioux River in the town of Sioux Falls, 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@N05/8287961376/ |
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@N05/8287961376. 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 | ![]() | 960 × 590 (459 KB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/8287961376/ with UploadWizard |
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