Ravinia Sand Member (abandoned)
The Ravinia Sand Member has been abandoned. The former Ravinia Sand Member is now classified with the Dolton facies of the Henry Formation.
HANSEL, Ardith K. and W. Hilton JOHNSON, 1996, Wedron and Mason Groups: Lithostratigraphic Reclassification of Deposits of the Wisconsin Episode, Lake Michigan Lobe Area: Illinois State Geological Survey Bulletin 104, 116 p.
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