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Mt. Simon Formation

Structure on top of the Mt. Simon Formation in Cook County, Illinois

The Mt. Simon Formation is the deepest aquifer in the county and consits of mor than 2,000 feet of fine- to course-grained sandstone. The water quality diminishes with depth and is commonly saline below a depth of 1,300 feet. The groundwater is warmer and more mineralized than the water in the overlying Ironton-Galesville Formation water (Suter et al. 1959).

 


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

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Updated 2/5/2007 SLD