File:Penn carbondale 4-3.jpg
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Figure 4-3. Log of DTE Methane No. 11-1 Lexington borehole in sec. 11, T 6 S, R 2 E, Franklin County, Illinois. This is the reference log for the Carbondale Formation. Lithologic patterns in the center column denote cored intervals. © University of Illinois Board of Trustees.
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