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Geologic units in Washtenaw county, Michigan

Coldwater Shale (Mississippian) at surface, covers 59 % of this area

Coldwater Shale

Marshall Sandstone (Mississippian) at surface, covers 15 % of this area

Marshall Sandstone

Antrim Shale (Late Devonian) at surface, covers 7 % of this area

Antrim Shale

Traverse Group (Middle Devonian) at surface, covers 6 % of this area

Traverse Group

Berea Sandstone (Late Devonian) at surface, covers 4 % of this area

Berea Sandstone

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

Bedford Shale

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

Sunbury Shale

Dundee Limestone (Middle Devonian) at surface, covers 2 % of this area

Dundee Limestone

Detroit River Group (Middle Devonian) at surface, covers 0.5 % of this area

Detroit River Group

Michigan Formation (Mississippian) at surface, covers 0.4 % of this area

Michigan Formation