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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 Ancell Formation in Lake County, Illinois
Map of Lake County showing the top of the Ancell Formation. Map of Lake County showing the thickness of the Ancell to Ironton Formation

Three-dimensional representation of the thickness of the Ancell Formation to the Ironton Formation

Ancell Formation

In Lake County, the Ancell consists primarily of medium-grained St. Peter Sandstone. It is a moderately important groundwater resource, but its permeability and yield are not as high as the underlying Ironton-Galesville or Mt. Simon Sandstones.

Left is a three-dimensional representation of the thickness of the Ancell Formation to the Ironton 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