Geologic units in Emmet county, Michigan

Traverse Group (Middle Devonian) at surface, covers 40 % of this area

Traverse Group

Detroit River Group (Middle Devonian) at surface, covers 40 % of this area

Detroit River Group

Dundee Limestone (Middle Devonian) at surface, covers 9 % of this area

Dundee Limestone

Bois Blanc Formation (Early Devonian) at surface, covers 5 % of this area

Bois Blanc Formation

Bell Shale (Middle Devonian) at surface, covers 4 % of this area

Bell Shale

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

Antrim Shale