File:Penn carbondale 4-29.jpg

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Figure 4-29. Graphic log from the ISGS No. 1 Eric Miller borehole in sec. 2, T 8 N, R 6 E, Peoria County, Illinois, the reference section for the Purington Shale. Coal and limestone units below the Colchester Coal have not been identified. © University of Illinois Board of Trustees.

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