Difference between revisions of "File:Penn carbondale 4-81.jpg"
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+ | |Caption=Figure 4-81. Strongly jointed, sheety Anna Shale in the roof of the Orient No. 4 underground mine, Williamson County, Illinois. Photograph 1976 from ISGS files. Brunton compass for scale. © University of Illinois Board of Trustees. | ||
+ | }} |
Latest revision as of 21:40, 4 January 2021
Figure 4-81. Strongly jointed, sheety Anna Shale in the roof of the Orient No. 4 underground mine, Williamson County, Illinois. Photograph 1976 from ISGS files. Brunton compass for scale. © University of Illinois Board of Trustees.
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