Geologic units in Mackinac county, Michigan

Point Aux Chenes Shale (Late Silurian) at surface, covers 12 % of this area: Point Aux Chenes Shale
Lithology: shale
Queenston Shale (Late Ordovician) at surface, covers 0.2 % of this area: Queenston Shale
Lithology: shale
Cataract Formation (Early Silurian) at surface, covers 0.7 % of this area: Cataract Formation
Lithology: shale; limestone; dolostone (dolomite); sandstone
Sainte Ignace Dolomite (Late Silurian) at surface, covers 0.5 % of this area: Sainte Ignace Dolomite
Lithology: dolostone (dolomite)
Stonington Formation (Late Ordovician) at surface, covers < 0.1 % of this area: Stonington Formation
Lithology: limestone; shale
Bois Blanc Formation (Early Devonian) at surface, covers 3 % of this area: Bois Blanc Formation
Lithology: limestone; dolostone (dolomite)
Big Hill Dolomite (Late Ordovician) at surface, covers < 0.1 % of this area: Big Hill Dolomite
Lithology: dolostone (dolomite); limestone
Mackinac Breccia (Early Devonian) at surface, covers 1 % of this area: Mackinac Breccia
Lithology: limestone; sedimentary breccia
Burnt Bluff Formation (Early Silurian) at surface, covers 21 % of this area: Burnt Bluff Formation
Lithology: limestone
Engadine Dolomite (Early Silurian) at surface, covers 42 % of this area: Engadine Dolomite
Lithology: dolostone (dolomite)
Manistique Formation (Early Silurian) at surface, covers 18 % of this area: Manistique Formation
Lithology: dolostone (dolomite); limestone