File:Penn caseyville 2-2.jpg
Figure 2-2. Graphic columns of the Caseyville type section and three reference sections. Column 1 after Lee (1916). Used courtesy of the Kentucky Geological Survey. Columns 2 to 4 from Kosanke et al. (1960); Palmer and Dutcher (1979) and unpublished field notes by W.J. Nelson and J.T. Popp; and Nelson and Weibel (1996) and unpublished field notes by W.J. Nelson, respectively. Copyright © 1960, 1979, and 1996 University of Illinois Board of Trustees.
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