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  5. Michigan geologic units

Geologic units in Sanilac county, Michigan

Marshall Sandstone (Mississippian) at surface, covers 50 % of this area

Marshall Sandstone

Coldwater Shale (Mississippian) at surface, covers 40 % of this area

Coldwater Shale

Bedford Shale (Late Devonian) at surface, covers 4 % of this area

Bedford Shale

Michigan Formation (Mississippian) at surface, covers 3 % of this area

Michigan Formation

Berea Sandstone (Late Devonian) at surface, covers 2 % of this area

Berea Sandstone

Sunbury Shale (Mississippian-Devonian) at surface, covers 2 % of this area

Sunbury Shale

Antrim Shale (Late Devonian) at surface, covers < 0.1 % of this area

Antrim Shale