Eau Claire Formation

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Eau Claire Formation
Stratigraphic range: Cambrian
Type Formation
Underlies Galesville Sandstone or Potosi Dolomite
Overlies Mount Simon Sandstone
Thickness 400 to 1000 feet in Indiana[1]
Primary Sandstone
Other Siltstone, shale, dolomite
Region Indiana, Illinois, Wisconsin, Michigan, 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[edit]


  1. ^ a b c d "Eau Claire Formation". Indiana Geological Survey. Retrieved 2015-05-18. 

Preceded by Proterozoic Eon Phanerozoic Eon
Paleozoic Era Mesozoic Era Cenozoic Era
Cambrian Ordovician Silurian Devonian Carboniferous Permian Triassic Jurassic Cretaceous Paleogene Neogene 4ry