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]

## See also

* List of fossiliferous stratigraphic units in Indiana

## References

1. ↑ 1.0 1.1 1.2 1.3 "Eau Claire Formation". Indiana Geological Survey. http://igs.indiana.edu/compendium/comp8gis.cfm.

## 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". Wisconsin Geological and Natural History Survey 19 (1). https://wgnhs.wisc.edu/pubshare/GS19.pdf.
* ((Various Contributors to the Paleobiology Database)). "Fossilworks: Gateway to the Paleobiology Database". https://www.fossilworks.org/.

Template:Chronostratigraphy of Illinois Template:Chronostratigraphy of Indiana Template:Chronostratigraphy of Minnesota Template:Chronostratigraphy of Ohio Template:Chronostratigraphy of Wisconsin

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