Coldwater Shale

Coldwater Shale
Stratigraphic range: Mississippian
TypeFormation
UnderliesMarshall Sandstone and New Providence Shale
OverliesSunbury Shale
Location
RegionIndiana, Michigan, and Ohio
CountryUnited States

The Coldwater Shale is a geologic formation in Michigan, named after the Coldwater River. It preserves fossils dating back to the Mississippian period.

References

  1. ↑ "Geolex — Coldwater publications". National Geologic Map Database. U.S. Geological Survey. Retrieved 17 April 2026.
  2. ↑ Hale, Lucille (1 April 1941). "Study of Sedimentation and Stratigraphy of Lower Mississippian in Western Michigan". AAPG Bulletin. 25 (4): 713–723. doi:10.1306/3D9332D8-16B1-11D7-8645000102C1865D.