File:Penn carbondale 4-69.jpg
Figure 4-69. Graphic log based on core from Peabody Energy borehole no. 15-H7, sec. 15, T 6 N, R 8 W, Sullivan County, Indiana, the reference section for the Bucktown Coal Member of previous authors. After Willman and Payne (1942). Copyright © 1942 Illinois State Geological Survey.
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