Name: Bedrock Geology, Volcanic under Lake Superior Keweenawan (S21, 2011)

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Description: GEOLOGIC MAP OF MINNESOTA—BEDROCK GEOLOGY Minnesota Geological Survey State Map Series S-21 Scale 1:500,000 Minnesota Geological Survey February 28, 2011 http://purl.umn.edu/101466 Map depicts the extension of igneous bedrock units from the shoreline of Lake Superior to the Minnesota border in the lake. This coverage also shows geology beneath a variably thick veneer of sedimentary rocks (Layer “Keweenawan sediment cover”). With the exception of a very few islands, the geologic depiction is based solely on extrapolation from exposures on the mainland via geophysical imagery.

Copyright Text: Minnesota Geological Survey, Mark A. Jirsa, Terrence J. Boerboom, Val W. Chandler, John H. Mossler, Anthony C. Runkel, and Dale R. Setterholm

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Last Edit Date: 2/5/2025 2:57:03 PM

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Data Last Edit Date: 2/5/2025 2:57:03 PM

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