Tipping, R.G.Lusardi, B.A.2010-03-262010-03-261996https://hdl.handle.net/11299/59848The map is modified from the Geologic map of Minnesota, bedrock geology: MGS State Map Series S-20.This simplified geologic map shows the general distribution of rock types underlying Minnesota's landscape. Some of the rocks are 3.6 billion years old-the oldest found so far in the United States.Other