This is an informal unit. A formal description has not been peer-reviewed or published.
D. A. Grimley
Extent and thickness
Well log characteristics
Age and correlation
Environments of deposition
GRIMLEY, D. A., 2010, Surficial Geology of Mascoutah Quadrangle, St. Clair County, Illinois: Illinois State Geological Survey, Illinois Geologic Quadrangle Map, IGQ Mascoutah-SG Revision, 2 sheets, 1:24,000; report, 9 p.
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