Eau Claire Formation Stratigraphic range: Cambrian |
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Type |
Formation |
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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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Lithology |
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Primary |
Sandstone |
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Other |
Siltstone, shale, dolomite |
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Location |
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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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Type section |
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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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The Eau Claire Formation is a geologic formation in the north central United States. It preserves trilobite fossils from the Cambrian Period.[1]
References
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Ph | Cz | Q |
- Glacial and post-glacial unconsolidated deposits
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Mz | K | Upper |
- unnamed Upper? Cretaceous formations, western and southeastern Minnesota
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Pz | |
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pЄ | ♇ | Y |
- Fond du Lac Formation
- Hinckley Sandstone
- North Shore Volcanic Group
- Puckwunge Conglomerate
- Solor Church Formation (subsurface only)
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X |
- Gunflint Formation
- Kakabeka Formation
- Mahnoman Formation
- Trommald Formation
- Virginia Formation
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