Coldwater Shale
Antrim Shale
Traverse Group
Bedford Shale
Marshall Sandstone
Berea Sandstone
Sunbury Shale
Dundee Limestone
Detroit River Group
Shale; gray; clayey thin bedded; siderite nodules common; as much as 150 feet thick.
Shale and siltsone; shale, black to brownish-black, carbonaceous in upper one third of interval, gray to bluish-gray, clayey with occasional siltstone lamina and thin beds in lower two-thirds of interval.
Shale; dark brown to black; carbonaceous, thinly laminated; 0 to 230 feet thick.