File:Penn carbondale 4-70.jpg
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Figure 4-70. Graphic log of part of the core from Arch Minerals borehole 57 in sec. 14, T 6 S, R 4 W, Perry County, Illinois, the type section of the Percy Limestone Member (new to this report). © University of Illinois Board of Trustees.
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| current | 22:10, 23 December 2020 | | 1,364 × 2,176 (437 KB) | IlLex (talk | contribs) |
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