Mineral Resources
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Geology
by state
Michigan geologic units
Geologic units in Saint Clair county, Michigan
Coldwater Shale
(Mississippian)
at surface, covers 39 % of this area
Coldwater Shale
Bedford Shale
(Late Devonian)
at surface, covers 18 % of this area
Bedford Shale
Berea Sandstone
(Late Devonian)
at surface, covers 14 % of this area
Berea Sandstone
Antrim Shale
(Late Devonian)
at surface, covers 13 % of this area
Antrim Shale
Sunbury Shale
(Mississippian-Devonian)
at surface, covers 11 % of this area
Sunbury Shale
Marshall Sandstone
(Mississippian)
at surface, covers 6 % of this area
Marshall Sandstone