File:Penn carbondale 4-35.jpg
Figure 4-35. Graphic log from the Audubon Oil & Gas No. 1 Birkner borehole in sec. 24, T 4 S, R 6 E, Hamilton County, Illinois, showing overthickened Survant Coal, evidently in a channel and analogous to the Cardiff, Kerton Creek, and Roodhouse coal beds. © University of Illinois Board of Trustees.
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