Eau Claire Formation
| Eau Claire Formation Stratigraphic range: Cambrian |
|
|---|---|
| Type | Formation |
| Underlies | Galesville Sandstone or Potosi Dolomite |
| Overlies | Mount Simon Sandstone |
| Thickness | 400 to 1000 feet in Indiana |
| Lithology | |
| Primary | Sandstone |
| Other | Siltstone, shale, dolomite |
| Location | |
| Region | Indiana, Illinois, Wisconsin, Michigan, western Ohio, and western Kentucky. Equivalent to the Bonneterre Formation in Missouri |
| Country | United States |
| Type section | |
| Named for | Outcrops along the Eau Claire River, Eau Claire County, Wisconsin |
| Named by | E. O. Ulrich |
The Eau Claire Formation is a geologic formation in the north central United States. It preserves trilobite fossils from the Cambrian Period.
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