Mineral Resources
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Geology
by state
Michigan geologic units
Geologic units in Montmorency county, Michigan
Antrim Shale
(Late Devonian)
at surface, covers 52 % of this area
Antrim Shale
Coldwater Shale
(Mississippian)
at surface, covers 27 % of this area
Coldwater Shale
Bedford Shale
(Late Devonian)
at surface, covers 9 % of this area
Bedford Shale
Traverse Group
(Middle Devonian)
at surface, covers 9 % of this area
Traverse Group
Sunbury Shale
(Mississippian-Devonian)
at surface, covers 2 % of this area
Sunbury Shale