Geologic units in Sanilac county, Michigan

Bedford Shale (Late Devonian) at surface, covers 4 % of this area: Bedford Shale
Lithology: shale; sandstone
Sunbury Shale (Mississippian-Devonian) at surface, covers 2 % of this area: Sunbury Shale
Lithology: black shale
Berea Sandstone (Late Devonian) at surface, covers 2 % of this area: Berea Sandstone
Lithology: sandstone; siltstone
Coldwater Shale (Mississippian) at surface, covers 40 % of this area: Coldwater Shale
Lithology: shale; limestone; dolostone (dolomite); sandstone; siltstone
Antrim Shale (Late Devonian) at surface, covers < 0.1 % of this area: Antrim Shale
Lithology: black shale; limestone
Marshall Sandstone (Mississippian) at surface, covers 50 % of this area: Marshall Sandstone
Lithology: sandstone; siltstone
Michigan Formation (Mississippian) at surface, covers 3 % of this area: Michigan Formation
Lithology: shale; black shale; sandstone; dolostone (dolomite); limestone; evaporite