Eau Claire Formation

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[1]
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[1]
Country	United States
Type section
Named for	Outcrops along the Eau Claire River, Eau Claire County, Wisconsin[1]
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.^[1]

• List of fossiliferous stratigraphic units in Indiana

• 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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