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![]() Date: 2001-08-28 20:25:13Plate tectonics Geology of Minnesota Proterozoic Midcontinent Rift System Nonesuch Shale Michigan Basin Source rock Lake Superior Superior craton Geology Structural geology Sedimentary rocks | Source URL: certmapper.cr.usgs.govDownload Document from Source WebsiteFile Size: 204,52 KBShare Document on Facebook |