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Figure 4-14. Gamma ray/density and neutron log from the Peabody Natural Gas No. 2 Short borehole in sec. 14, T 7 S, R 7 E, Hamilton County, Illinois, illustrating the log response of Davis, Will Scarlet, Dekoven, and associated units. © University of Illinois Board of Trustees. +
Figure 4-15. Graphic log of the ISGS No. 1 Morris borehole in Williamson County, the type section for the Will Scarlet Shale Member. Location is in sec. 6, T 10 S, R 4 E, Williamson County, Illinois. © University of Illinois Board of Trustees. +
Figure 4-16. Thickness of the “parting in the Dekoven Coal.” Modified from Jacobson (1993). Copyright ©1993 University of Illinois Board of Trustees. +
Figure 4-17. Type section of the Abingdon Coal Member on a tributary of Brush Creek, central part of sec. 6, T 9 N, R 2 E, Knox County, Illinois. Based on ISGS unpublished field notes by H.R. Wanless (August 1929). © University of Illinois Board of Trustees. +
Figure 4-18. Map of the type area of the Colchester Coal, showing locations of the measured sections in Figure 4-19. Base map is a Colchester 7.5-minute topographic sheet, used courtesy of the U.S. Geological Survey. +
Figure 4-19. Measured sections from the type area of the Colchester Coal in McDonough County, Illinois. See Figure 4-18 for locations. Columns 1 and 5 from ISGS unpublished field notes by Nelson (1983). Column 2 from Wanless (1929). Copyright © 1929 University of Illinois Board of Trustees. Column 3 from ISGS unpublished field notes by D.L. Reinertsen and R.L. Berger (1959). Column 4 from ISGS unpublished field notes by D.L. Reinertsen and R.L. Berger (1959) and Nelson (1983). +
Figure 4-2. Reference section for the Carbondale Formation in western Illinois.
After Kosanke et al. (1960). Current nomenclature is applied. © University of Illinois Board of Trustees. +
Figure 4-20. Field sketch by W.J. Nelson (1983) illustrating apparent splitting of the Colchester Coal. Underclay and lower splits of coal are at the lower right. Separating the lower and upper coal benches is gray, weakly laminated siltstone that resembles normal Francis Creek Shale. No underclay or rooted zone was observed below the upper coal bench. This feature may have formed when the bulk of the Colchester peat deposit was rafted during early stages of Francis Creek deposition. Sandstone overlying the coal underwent compressional folding and shearing prior to lithification, possibly as a result of sediment compaction. Width of view: ~75 feet (23 m) laterally and 25 feet (7.6 m) vertically. Locality: Stream bank in Argyle Lake State Park, SE1/4 NE1/4 SW1/4, sec. 31, T 6 N, R 3 W, McDonough County. © University of Illinois Board of Trustees. +
Figure 4-21. Type section of the Francis Creek Shale. Modified from Wanless (1957). Copyright © 1957 University of Illinois Board of Trustees. +
Figure 4-22. Log of Northern Illinois Gas borehole PON-62 in sec. 2, T 27 N, R 6 E, Livingston County, Illinois. This is a reference section for the Francis Creek Shale Member. © University of Illinois Board of Trustees. +
Figure 4-23. Isopach map of the Francis Creek Shale. From Korose et al. (2003), modified from Smith et. al (1970). Copyright © 1970, 2003 University of Illinois Board of Trustees. +
Figure 4-24. Pods of Francis Creek Shale above depressions in the Colchester Coal as exposed on the highwall at United Electric Coal Companies Banner Mine, SE1/4, NW1/4, sec. 12, T 6 N, R 5 E, Fulton County, Illinois. From Smith et al. (1970). Copyright © 1970 University of Illinois Board of Trustees. +
Figure 4-25. Wolf Bridge section in sec. 13, T 10 N, R 3 E, Knox County, Illinois, the reference section for the Oak Grove Member. From Smith et al. (1970). Copyright © 1970 University of Illinois Board of Trustees. +
Figure 4-26. Diagram showing how Wright (1965) interpreted regional relationships of the Oak Grove Member and adjacent units. Copyright © 1965 Cynthia R. Wright. Used with permission. +
Figure 4-27. Diagram from Wanless (1964), illustrating his hypothesis that the Wheeler and Bevier Coal Beds wedge out into the Oak Grove succession of marine shale and limestone. Used with permission of the Kansas Geological Survey. +
Figure 4-28. Graphic log from the Audubon Oil & Gas No. A-1 Green borehole in sec. 30, T 2 S, R 10 E, Edwards County, Illinois, reference section for the Purington Shale. © University of Illinois Board of Trustees. +
Figure 4-29. Graphic log from the ISGS No. 1 Eric Miller borehole in sec. 2, T 8 N, R 6 E, Peoria County, Illinois, the reference section for the Purington Shale. Coal and limestone units below the Colchester Coal have not been identified. © University of Illinois Board of Trustees. +
Figure 4-3. Log of DTE Methane No. 11-1 Lexington borehole in sec. 11, T 6 S, R 2 E,
Franklin County, Illinois. This is the reference log for the Carbondale Formation. Lithologic patterns in the center column denote cored intervals. © University of Illinois Board of Trustees. +
Figure 4-30. Type section of the Survant Coal Member, as described by Wier (1961).
Data used under Creative Commons license CC BY-NC-SA 3.0. +
Figure 4-31. Graphic log of the Audubon Oil & Gas No. 1 Fritschle borehole in sec. 20, T 6 N, R 9 E, Jasper County, Illinois, the reference section for the Wheeler and Bevier Coals in Illinois. © University of Illinois Board of Trustees. +