// Workers AI · dad joke modeWhat did the Coldwater Shale say? "I'm rock solid.
 | This article needs more citations. (April 2026) |
| Coldwater Shale | |
|---|---|
| Stratigraphic range: Mississippian | |
| Type | Formation |
| Underlies | Marshall Sandstone and New Providence Shale |
| Overlies | Sunbury Shale |
| Location | |
| Region | Indiana, Michigan, and Ohio |
| Country | United States |
The Coldwater Shale is a geologic formation in Michigan, named after the Coldwater River.[1] It preserves fossils dating back to the Mississippian period.[2]
References
[edit]- ↑ "Geolex — Coldwater publications". National Geologic Map Database. U.S. Geological Survey. Retrieved 17 April 2026.
- ↑ 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.
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