Shaded relief image ofMinnesotain centralNorth America,from National Atlas Mapmaker[1]archive copyat theWayback Machine,modified to show generalized view of geologic regions, after Sansome, Constance J. (1983)Minnesota Underfoot: A Field Guide to the State's Outstanding Geologic Features,Stillwater, MN: Voyageur Press,ISBN0-8965-8036-9;and (with respect to northern boundary of Southwest Minnesota) Ojakangas, Richard R. and Matsch, Charles L. (1982)Minnesota's Geology,Minneapolis, MN: University of Minnesota Press,ISBN0-8166-0953-5.As to modifications, submitter releases all rights and specifically licenses use of this image underen:GNU Free Documentation License.

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