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  5. Michigan geologic units

Geologic units in Macomb county, Michigan

Coldwater Shale (Mississippian) at surface, covers 56 % of this area

Coldwater Shale

Antrim Shale (Late Devonian) at surface, covers 25 % of this area

Antrim Shale

Sunbury Shale (Mississippian-Devonian) at surface, covers 7 % of this area

Sunbury Shale

Berea Sandstone (Late Devonian) at surface, covers 6 % of this area

Berea Sandstone

Bedford Shale (Late Devonian) at surface, covers 6 % of this area

Bedford Shale