File:GOI-ch15-fig15.jpg
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Generalized geological column of southern Illinois. Size of solid dots indicates relative amount of petroleum produced from individual pay zones. Formation names are in capital letters. Abbreviations: A., Alexandrian; Cinc., Cincinnatian; Cr., Creek; E., eastern; Gol., Golconda; Incl., including; K., Kinderhookian; L., lower; Niag.-Cayug., Niagaran-Cayugan; P. Cr. Sd, Paint Creek Sand; Ren., Renault; Sh, shale; U., upper; U.P.C., Upper Paint Creek; W., western.
Modified from: Kolata, Dennis R, and Cheryl Nimz, eds., 2010, Geology of Illinois: University of Illinois at Urbana-Champaign, Institute of Natural Resource Sustainability, Illinois State Geological Survey, 530 p.
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