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  5. Michigan geologic units

Geologic units in Lapeer county, Michigan

Marshall Sandstone (Mississippian) at surface, covers 48 % of this area

Marshall Sandstone

Michigan Formation (Mississippian) at surface, covers 35 % of this area

Michigan Formation

Coldwater Shale (Mississippian) at surface, covers 17 % of this area

Coldwater Shale