Mineral Resources
Online Spatial Data
Geology
by state
Michigan geologic units
Geologic units in Crawford county, Michigan
Coldwater Shale
(Mississippian)
at surface, covers 40 % of this area
Coldwater Shale
Michigan Formation
(Mississippian)
at surface, covers 33 % of this area
Michigan Formation
Marshall Sandstone
(Mississippian)
at surface, covers 27 % of this area
Marshall Sandstone