SiouxQuartzite

SiouxQuartzite - End of Early Proterozoic Sioux Quartzite...

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End of Early Proterozoic Sioux Quartzite (Post Penokean) Bedrock exposed mainly in NE SW Minnesota Rocks include quartz sandstones and clay deposits (catlinite) Quartz sandstones sit atop low relief erosion surface (unconformity) formed by a long period of erosion of the Penokean mountains - deposited 1.76-1.63 Ga
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Cross Section of Late Proterozoic Rocks in MN and their Relationship to Underlying and Overlying Rocks
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Late Proterozoic Sioux Quartzite Pure quartz sand produced by several hundred million year erosion of Early Proterozoic rocks Deposited sometime between 1.76 and 1.63 Ga ~5,000 feet thick in SW Minnesota and adjacent South Dakota Nopeming Fm (25’ thick) in Duluth area, and Puckwunge Fm(200’ thick) in NE Minnesota Lower 2/3 deposited in rivers, upper 1/3 in shallow sea Used for decorative stone (see the facing of the Choate Building in downtown Winona) and aggregate. The clay in the formation is used by Native Americans for crafting of pipes
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Sioux Quartzite at Blue Mounds State Park, Luverne, MN
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Sioux Quartzite Exposure in Sioux Falls
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This note was uploaded on 04/17/2008 for the course GEOS 120 taught by Professor Meyers during the Spring '05 term at Winona.

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SiouxQuartzite - End of Early Proterozoic Sioux Quartzite...

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