File:Penn carbondale 4-79.jpg
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Figure 4-79. Lens of Energy Shale sharply truncated by Anna Shale in the Orient No. 4 underground mine, Williamson County, Illinois. Photograph 1976 from ISGS files. The geologist is Christopher Ledvina. © University of Illinois Board of Trustees.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | ★ Approved revision 21:34, 4 January 2021 | | 2,588 × 2,104 (2.27 MB) | Jennifer.Obrad (talk | contribs) |
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