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Eau Claire Formation
Stratigraphic range: Cambrian
Eau Claire Formation (Middle to Upper Cambrian; Warren County core, Ohio)
Type	Formation
Unit of	Munising Group
Underlies	Davis Formation, Galesville Sandstone, Kerbel Formation, Knox Dolomite, and 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, Minnesota, 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.

See also

• List of fossiliferous stratigraphic units in Indiana

References

1. ^ "Eau Claire Formation". Indiana Geological Survey. Retrieved 2015-05-18.

Sources

• Aswasereelert, Wasinee; Simo, J.A. (Toni); LePain, David L. (2008). "Deposition of the Cambrian Eau Claire Formation, Wisconsin: hydrostratigraphic implications of fine-grained cratonic sandstones" (PDF). Wisconsin Geological and Natural History Survey. 19 (1).
• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.

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• Cambrian United States
• Dolomite formations
• Cambrian Kentucky
• Cambrian Illinois
• Cambrian Indiana
• Cambrian Michigan
• Cambrian Ohio
• Cambrian geology of Wisconsin
• Cambrian System of North America
• Cambrian southern paleotemperate deposits
• Cambrian southern paleotropical deposits
• United States geologic formation stubs