Eau Claire Formation

The Eau Claire Formation is a geologic formation in the north central United States. It preserves trilobite fossils from the Cambrian Period.[1]

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

See also

• List of fossiliferous stratigraphic units in Indiana

References

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

• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Archived from the original on 31 July 2014. Retrieved 22 June 2014.