Michigan Formation
 |
| Michigan Formation | |
|---|---|
| Stratigraphic range: Mississippian | |
| Type | Formation |
| Underlies | Bayport Limestone |
| Overlies | Marshall Sandstone |
| Location | |
| Region | Michigan |
| Country | United States |
The Michigan Formation is a geologic formation in the U.S. state of Michigan. It preserves fossils dating back to the Mississippian period.
Gypsum has been mined in Whittemore, Tawas City, Alabaster, and Grand Rapids from the Michigan formation--the only formation in the state making such mining commercially profitable. Gypsum has been mined in these varieties: gypsum, "alabaster", satin spar, and selenite.[1]
References
- ^ Door, John A.; Eschman, Donald F. (1977). Geology of Michigan (3rd ed.). U.S.: University of Michigan Press. pp. 111, 113. ISBN 0-472-08280-9.
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.
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