Geologic units in Wayne county, Michigan

Antrim Shale (Late Devonian) at surface, covers 32 % of this area

Antrim Shale

Traverse Group (Middle Devonian) at surface, covers 24 % of this area

Traverse Group

Dundee Limestone (Middle Devonian) at surface, covers 22 % of this area

Dundee Limestone

Detroit River Group (Middle Devonian) at surface, covers 15 % of this area

Detroit River Group

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

Bedford Shale

Berea Sandstone (Late Devonian) at surface, covers 1 % of this area

Berea Sandstone

Sylvania Sandstone (Early Devonian) at surface, covers 0.8 % of this area

Sylvania Sandstone

Coldwater Shale (Mississippian) at surface, covers 0.3 % of this area

Coldwater Shale

Sunbury Shale (Mississippian-Devonian) at surface, covers < 0.1 % of this area

Sunbury Shale