Keywords: MNGeolRegions.GIF Shaded relief image of Minnesota in central North America from National Atlas Mapmaker http //www nationalatlas gov/natlas/Natlasstart asp 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 ISBN 0-8965-8036-9; 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 ISBN 0-8166-0953-5 As to modifications submitter releases all rights and specifically licenses use of this image under en GNU Free Documentation License PD-USGov Geology of Minnesota |