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Lake County | Quaternary | Maquoketa Formation | Silurian | Galena-Platteville Interval | Ancell Formation |
Ironton-Galesville | Eau Claire Formation | Mt. Simon Sandstone | Cross Sections


Surface Maps, Thickness Maps and a Three-dimensional Model of the Eau Claire in Lake County, Illinois

Map of Lake County showing the top of the Eau Claire Formation Map of Lake County showing the thickness of the Eau Claire Formation
Three-dimensional representation of the thickness of the Eau Claire Formation.

Eau Claire Formation

The Eau Claire consists of a silty, argillaceous dolomitic sandstone. It is an important aquitard that separates the underlying Mt. Simon from the Ironton-Galesville.

Left is a three-dimensional representation of the thickness of the Eau Claire Formation.



 

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ILLINOIS STATE GEOLOGICAL SURVEY
INSTITUTE OF NATURAL RESOURCE SUSTAINABILITY     |    UNIVERSITY OF ILLINOIS AT URBANA-CHAMPAIGN

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Updated 2/7/2007 SLD