File:Penn carbondale 4-80.jpg
Figure 4-80. Thin lens of Energy Shale truncated with an angular contact by the overlying Anna Shale at the Orient No. 4 underground mine, Williamson County, Illinois. Laminations in the Energy Shale can be seen on the left side of the photograph. The knobby lower surface of the Brereton Limestone can be seen at the top of the image. Approximate height of view is 5 ft (1.5 m). Photograph 1976 from ISGS files. © University of Illinois Board of Trustees.
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