Figure 2. Surficial geologic map of Mclean County and surrounding areas (Modified from Stiff et al., [28]). Study area is outlined in black. Positions of the major moraines are indicated. Pink = Illinoisan units; Oranges = various outwash facies of the Henry Formation; Pale purple = Equality Formation, Dull green and teal = Wedron Formation, Bright green = Grayslake Peat; Yellow = Cahokia Alluvium

From

Stratigraphy and Extent of the Pearl-Ashmore Aquifer, Mchenry County, IL, USA

Carlock Drew C., Thomason Jason F., Malone David H., Peterson Eric W.

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