DescriptionInterbedded graywacke-siltstone-slate (Mud Lake sequence, Neoarchean; Bourgin Road roadcut, Virginia, Minnesota, USA) 3 (22878917114).jpg
Interbedded graywacke-siltstone-slate in the Precambrian of Minnesota, USA.
This is an outcrop of slightly metamorphosed shale-siltstone-graywacke outcrop that was smoothed and striated by glaciers during the Pleistocene Ice Age.
Geologic unit & age: Mud Lake sequence, Neoarchean.
Locality: roadcut along the eastern side of Bourgin Road roadcut, just southeast of the Rt. 53-Rt. 135 intersection, southeast of the town of Virginia, central St. Louis County, northeastern Minnesota, USA.
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