Geologic units in Luce county, Michigan

Jacobsville Sandstone (Middle Proterozoic) at surface, covers 14 % of this area

Red, brown, and white quartzose sandstone, and minor siltstone, shale and conglomerate

Utica Shale (Late Ordovician) at surface, covers 13 % of this area

Utica Shale

Munising Formation (Late Cambrian) at surface, covers 10 % of this area

Munising Formation

Trenton Limestone (Late Ordovician) at surface, covers 9 % of this area

Trenton Limestone

Stonington Formation (Late Ordovician) at surface, covers 9 % of this area

Stonington Formation

Black River Limestone (Late Ordovician) at surface, covers 9 % of this area

Black River Limestone

Trempealeau Formation (Late Cambrian) at surface, covers 8 % of this area

Trempealeau Formation

Prairie du Chien Group (Early Ordovician) at surface, covers 6 % of this area

Prairie du Chien Group

Burnt Bluff Formation (Early Silurian) at surface, covers 6 % of this area

Burnt Bluff Formation

Cataract Formation (Early Silurian) at surface, covers 5 % of this area

Cataract Formation

Queenston Shale (Late Ordovician) at surface, covers 4 % of this area

Queenston Shale

Big Hill Dolomite (Late Ordovician) at surface, covers 4 % of this area

Big Hill Dolomite

Collingwood Limestone (Late Ordovician) at surface, covers 2 % of this area

Collingwood Limestone