Uppermost stratigraphic units

Cross sections through the uppermost stratigraphic units in Lake County, Illinois. The Quaternary and Silurian are important aquifers for residential use.

All stratigraphic units

Cross sections through stratigraphic units in Lake County, Illinois, illustrating the morphology of important aquifers and aquitards.

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

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