Sioux Falls & Sioux Quartzite (Paleoproterozoic, 1.65-1.70 Ga; Falls Park, Sioux Falls, South Dakota, USA) 1

            Quartzites 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 quarried in southeastern South Dakota and southwestern Minnesota.  Material from these quarries is used as road gravel, sidewalk and paving gravel, and erosion control blocks.

Stratigraphy: Sioux Quartzite, upper Paleoproterozoic, 1.65-1.70 Ga

Locality: Falls Park, along the Big Sioux River in the town of Sioux Falls, southeastern South Dakota, USA
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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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Taken on: December 19, 2012

Tags:

South

Dakota

Falls

Quartzite

Precambrian

Proterozoic

Paleoproterozoic

sandstone

Transcontinental

Arch « less

Sets appears in: • South Dakota Rocks & Fossils • Paleoproterozoic Rocks & Fossils more » • Rivers, Streams, Waterfalls, Lakes, Valleys • Waterfalls • Sioux Quartzite (South Dakota & elsewhere, USA) « less

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