File:Penn carbondale 4-44.jpg
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Figure 4-44. Graphic log of core (partial) from Freeman United Coal Mining Company hole C-1-74 in sec. 23, T 12 N, R 6 W, Macoupin County, Illinois, the principal reference section for the Excello Shale and Houchin Creek Coal Members in Illinois. © University of Illinois Board of Trustees.
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