The Eau Claire Formation is a geologic formation in the north central United States. It preserves trilobite fossils from the Cambrian Period.[1]
Quick Facts Type, Unit of ...
| Eau Claire Formation |
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 Eau Claire Formation (Middle to Upper Cambrian; Warren County core, Ohio) |
| Type | Formation |
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| Unit of | Munising Group |
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| Underlies | Davis Formation, Galesville Sandstone, Kerbel Formation, Knox Dolomite, and Potosi Dolomite |
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| Overlies | Mount Simon Sandstone |
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| Thickness | 400 to 1000 feet in Indiana[1] |
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| Primary | Sandstone |
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| Other | Siltstone, shale, dolomite |
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| Region | Indiana, Illinois, Wisconsin, Michigan, Minnesota, western Ohio, and western Kentucky. Equivalent to the Bonneterre Formation in Missouri[1] |
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| Country | United States |
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| Named for | Outcrops along the Eau Claire River, Eau Claire County, Wisconsin[1] |
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| Named by | E. O. Ulrich |
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