File:Penn carbondale 4-45.jpg
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Figure 4-45. Graphic logs from three cores drilled by Rust E & I in St. Clair County, Illinois, illustrating the unnamed gray shale that locally occurs between the Houchin Creek Coal and the Excello Shale. © University of Illinois Board of Trustees.
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current | ★ Approved revision 19:20, 23 December 2020 | 2,244 × 3,021 (948 KB) | Jennifer.Obrad (talk | contribs) |
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