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- 19:58, 1 April 2016 diff hist +37 N File:Figure D-6.jpg Fig. D-6 -- Typical Devonian fossils. current
- 19:57, 1 April 2016 diff hist +90 N File:Figure D-5.jpg Fig. D-5 -- Development of the classification of the Devonian System in southern Illinois. current
- 19:56, 1 April 2016 diff hist +90 N File:Figure D-4.jpg Fig. D-4 -- Development of the classification of the Devonian System in northern Illinois. current
- 19:52, 1 April 2016 diff hist +50 N File:Figure D-2.jpg Fig. D-2 -- Classification of the Devonian System. current
- 19:51, 1 April 2016 diff hist +46 N File:Figure D-1.jpg Fig. D-1 -- Thickness of the Devonian Systems. current
- 19:40, 1 April 2016 diff hist +48 N File:Figure 17.jpg Fig. 17 -- Patterns and symbols used in figures. current
- 19:39, 1 April 2016 diff hist +190 N File:Figure 16.jpg Fig. 16 -- Development of the stratigraphic classifications used in Illinois. The references include reports that introduced changes in the classification and others that show typical usage. current
- 19:38, 1 April 2016 diff hist +107 N File:Figure 15.jpg Fig. 15 -- Topography of the bedrock surface of Illinois (after Horberg, 1950a and Willman and Frye, 1970). current
- 19:36, 1 April 2016 diff hist +92 N File:Figure 14.jpg Fig. 14 -- Pre-Pennsylvanian megagroups and sequences of Illinois (Swann and Willman, 1961). current
- 19:35, 1 April 2016 diff hist +98 File:Figure 13.jpg current
- 15:57, 1 April 2016 diff hist +189 N File:Figure 11.jpg Fig. 11 -- Generalized surficial geology of Illinois. In uneroded areas the loess thins from 25-100 feet thick in the bluffs of the major valleys to 1-2 feet in areas farthest from valleys. current
- 15:54, 1 April 2016 diff hist +51 N File:Figure 9.jpg Fig. 9 -- Index map showing counties and townships. current
- 15:53, 1 April 2016 diff hist +44 N File:Figure 8.jpg Fig. 8 -- Topography and rivers of Illinois. current
- 15:52, 1 April 2016 diff hist +76 N File:Figure 7.jpg Fig. 7 -- Physiographic divisions of Illinois (after Leighton et al., 1948). current
- 15:51, 1 April 2016 diff hist +59 N File:Figure 6.jpg Fig. 6 -- Geologic map of Illinois by Stuart Weller (1907). current
- 15:50, 1 April 2016 diff hist +59 N File:Figure 5.jpg Fig. 5 -- Geologic map of Illinois by A. H. Worthen (1875). current
- 15:49, 1 April 2016 diff hist +131 N File:Figure 4.jpg Fig. 4 -- Index to volumes issued by the Geological Survey of Illinois (Worthen Survey) in which individual counties are described. current
- 15:46, 1 April 2016 diff hist +56 N File:Figure 3.jpg Fig. 3 -- Geologic map of Illinois by James Hall (1843). current
- 16:31, 31 March 2016 diff hist +151 N File:Figure O-2A.jpg Fig. O-2 A -- St. Peter Sandstone in Starved Rock along the Illinois River in Starved Rock State Park, 4 miles south-east of La Salle, La Salle County. current
- 16:24, 31 March 2016 diff hist +70 N File:Figure 1.jpg Fig. 1 -- Summary of the age, origin, and thickness of Illinois rocks. current
