Scale 1:250,000. See also Miscellaneous Map M-92, 1999, which is a limited revision of this map, in that it is available in digital formats, has a different scale (1:200,000), the eastern boundary is extended several miles to long. 95o30'W., and teh geology of the region has been slightly revised. Map M-80, 1994, has a more detailed description of map units, as well as a discussion of the regional geology.
Jirsa, M.A.; Runkel, A.C.; Chandler, V.W..
M-080 Bedrock geologic map of northwestern Minnesota.
Minnesota Geological Survey.
Retrieved from the University of Minnesota Digital Conservancy,
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