EarthWorks Geospatial Catalog

Keweenawan Rocks Under Lake Superior, Minnesota, 2012

Description
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.
Publisher
Minnesota Geological Survey
Place(s)
Minnesota
Year
2007
Held by
Minnesota