File:Penn carbondale 4-61.jpg

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Figure 4-61. Logs of ISGS McCormick No. 1 borehole in sec. 21, T 8 S, R 8 E, Gallatin County, Illinois, the reference sections for Canton Shale, Briar Hill Coal, and Big Creek Shale. © University of Illinois Board of Trustees.

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current21:52, 23 December 2020Thumbnail for version as of 21:52, 23 December 20202,257 × 3,316 (2.93 MB)IlLex (talk | contribs)