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Geologic units in Oakland county, Michigan

Coldwater Shale (Mississippian) at surface, covers 79 % of this area

Coldwater Shale

Marshall Sandstone (Mississippian) at surface, covers 7 % of this area

Marshall Sandstone

Bedford Shale (Late Devonian) at surface, covers 5 % of this area

Bedford Shale

Berea Sandstone (Late Devonian) at surface, covers 3 % of this area

Berea Sandstone

Sunbury Shale (Mississippian-Devonian) at surface, covers 3 % of this area

Sunbury Shale

Antrim Shale (Late Devonian) at surface, covers 2 % of this area

Antrim Shale

Michigan Formation (Mississippian) at surface, covers 0.3 % of this area

Michigan Formation

Traverse Group (Middle Devonian) at surface, covers < 0.1 % of this area

Traverse Group