File:Penn carbondale 4-74.jpg
Figure 4-74. Graphic log of the Madison Coal Corp. No. 25 borehole from sec. 12, T 8 S, R 3 E, Williamson County, Illinois, the reference section for the Herrin Coal Member. © University of Illinois Board of Trustees.
Click on a date/time to view the file as it appeared at that time.
|current||21:22, 4 January 2021||1,227 × 3,034 (433 KB)||IlLex|
- You cannot overwrite this file.