File:Penn carbondale 4-56.jpg
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Figure 4-56. Graphic log based on core from an Abandoned Mines Reclamation Council borehole in sec. 21, T 16 N, R 4 W, Sangamon County, Illinois, the principal reference section for the Springfield Coal Member. © University of Illinois Board of Trustees.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | ★ Approved revision 20:56, 23 December 2020 | | 1,935 × 2,917 (634 KB) | Jennifer.Obrad (talk | contribs) |
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