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Date Name Thumbnail Size Description Versions
16:24, 31 March 2016 Figure 1.jpg (file) 661 KB Fig. 1 -- Summary of the age, origin, and thickness of Illinois rocks. 1
16:31, 31 March 2016 Figure O-2A.jpg (file) 444 KB 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. 1
15:46, 1 April 2016 Figure 3.jpg (file) 273 KB Fig. 3 -- Geologic map of Illinois by James Hall (1843). 1
15:49, 1 April 2016 Figure 4.jpg (file) 274 KB Fig. 4 -- Index to volumes issued by the Geological Survey of Illinois (Worthen Survey) in which individual counties are described. 1
15:50, 1 April 2016 Figure 5.jpg (file) 350 KB Fig. 5 -- Geologic map of Illinois by A. H. Worthen (1875). 1
15:51, 1 April 2016 Figure 6.jpg (file) 344 KB Fig. 6 -- Geologic map of Illinois by Stuart Weller (1907). 1
15:52, 1 April 2016 Figure 7.jpg (file) 762 KB Fig. 7 -- Physiographic divisions of Illinois (after Leighton et al., 1948). 1
15:53, 1 April 2016 Figure 8.jpg (file) 834 KB Fig. 8 -- Topography and rivers of Illinois. 1
15:54, 1 April 2016 Figure 9.jpg (file) 895 KB Fig. 9 -- Index map showing counties and townships. 1
15:57, 1 April 2016 Figure 11.jpg (file) 1.89 MB 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. 1
19:35, 1 April 2016 Figure 13.jpg (file) 574 KB Fig. 13 -- Geologic cross section along the lines shown in figure 12 (after Willman er al., 1967). 1
19:36, 1 April 2016 Figure 14.jpg (file) 1.08 MB Fig. 14 -- Pre-Pennsylvanian megagroups and sequences of Illinois (Swann and Willman, 1961). 1
19:38, 1 April 2016 Figure 15.jpg (file) 1.73 MB Fig. 15 -- Topography of the bedrock surface of Illinois (after Horberg, 1950a and Willman and Frye, 1970). 1
19:39, 1 April 2016 Figure 16.jpg (file) 610 KB 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. 1
19:40, 1 April 2016 Figure 17.jpg (file) 301 KB Fig. 17 -- Patterns and symbols used in figures. 1
19:41, 1 April 2016 Figure C-2.jpg (file) 321 KB Fig. C-2 --Thickness of the Cambrian System. The dashed lines show reconstructed thickness. 1
19:42, 1 April 2016 Figure C-3.jpg (file) 377 KB Fig. C-3 -- columnar section of the Cambrian System. 1
19:43, 1 April 2016 Figure C-4.jpg (file) 585 KB Fig. C-4 -- Diagrammatic cross section of the Cambrian System from northwestern to southeastern Illinois. 1
19:44, 1 April 2016 Figure C-5.jpg (file) 388 KB Fig. C-5 -- Development of the classification of the Cambrian System. 1
19:45, 1 April 2016 Figure C-6.jpg (file) 233 KB Fig. C-6 -- Thickness of the Mt. Simon Sandstone. 1
19:46, 1 April 2016 Figure C-7.jpg (file) 261 KB Fig. C-7 -- Thickness of the Knox Dolomite Megagroup. 1
19:47, 1 April 2016 Figure C-8.jpg (file) 260 KB Fig. C-8 -- Thickness of the Eau Claire Formation. 1
19:47, 1 April 2016 Figure C-9.jpg (file) 231 KB Fig. C-9 -- Dominant rock types in the Eau Claire Formation. 1
19:48, 1 April 2016 Figure C-10.jpg (file) 204 KB Fig. C-10 -- Thickness of the Ironton and Galesville Sandstones. 1
19:49, 1 April 2016 Figure C-11.jpg (file) 263 KB Fig. C- 11 -- Thickness of the Franconia Formation 1
19:50, 1 April 2016 Figure C-12.jpg (file) 298 KB Fig. C-12 -- Thickness of the Potosi Dolomite. 1
19:51, 1 April 2016 Figure C-13.jpg (file) 293 KB Fig. C-13 -- Thickness of the Eminence Formation. 1
19:51, 1 April 2016 Figure D-1.jpg (file) 777 KB Fig. D-1 -- Thickness of the Devonian Systems. 1
19:52, 1 April 2016 Figure D-2.jpg (file) 546 KB Fig. D-2 -- Classification of the Devonian System. 1
19:56, 1 April 2016 Figure D-4.jpg (file) 408 KB Fig. D-4 -- Development of the classification of the Devonian System in northern Illinois. 1
19:57, 1 April 2016 Figure D-5.jpg (file) 779 KB Fig. D-5 -- Development of the classification of the Devonian System in southern Illinois. 1
19:58, 1 April 2016 Figure D-6.jpg (file) 1.56 MB Fig. D-6 -- Typical Devonian fossils. 1
19:59, 1 April 2016 Figure D-7.jpg (file) 525 KB Fig. D-7 -- Geologic map of the sub-Kaskaskia surface. 1
20:00, 1 April 2016 Figure D-8.jpg (file) 245 KB Fig. D-8 -- Thickness of the Lower Devonian Series. 1
20:03, 1 April 2016 Figure D-9.jpg (file) 211 KB Fig. D-9 -- Columnar section of the Lower Devonian Series. 1
20:04, 1 April 2016 Figure D-10.jpg (file) 318 KB Fig. D-10 -- Thickness of the Middle Devonian Series. 1
20:05, 1 April 2016 Figure D-11.jpg (file) 428 KB Fig. D-11 -- Columnar section of the Middle Devonian Series. 1
20:07, 1 April 2016 Figure D-12.jpg (file) 249 KB Fig. D-12 -- Thickness of the Wapsipinicon Limestone (after James, 1968). 1
20:08, 1 April 2016 Figure D-13.jpg (file) 291 KB Fig. D-13 -- Thickness of the Cedar Valley Limestone (after James, 1968). 1
20:09, 1 April 2016 Figure D-14.jpg (file) 232 KB Fig. D-14 -- Thickness of the Grand Tower Limestone (after North, 1969). 1
20:10, 1 April 2016 Figure D-15.jpg (file) 211 KB Fig. D-15 -- Thickness of the Lingle Formation (compliled from North, 1969). 1
20:12, 1 April 2016 Figure D-16.jpg (file) 273 KB Fig. D-16 -- Thickness of the Knobs Megagroup. 1
20:13, 1 April 2016 Figure D-17.jpg (file) 252 KB Fig. D-17 -- Thickness of the Blocher Shale (after North, 1969). 1
20:15, 1 April 2016 Figure D-18.jpg (file) 283 KB   1
20:17, 1 April 2016 Figure D-19.jpg (file) 194 KB Fig. D-19 -- Columnar section of the Upper Devonian Series. 1
20:17, 1 April 2016 Figure D-20.jpg (file) 152 KB Fig. D-20 -- Thickness of the Louisiana Limestone. 1
20:19, 1 April 2016 Figure K-3.jpg (file) 557 KB Fig. K-3 -- Distribution of Cretaceous, Paleocene, and Eocene strata in southern Illinois (after Willman et al., 1967). 1
20:20, 1 April 2016 Figure K-4.jpg (file) 216 KB Fig. K-4 -- Distribution of Cretaceous strata in western Illinois (after Frye et al., 1964). 1
13:04, 4 April 2016 Figure M-2.jpg (file) 1.38 MB Fig. M-2 -- Areal extent of the Mississippian System in Illinois. Thickness is shown where upper Chesterian strata are present. 1
13:22, 4 April 2016 Figure M-3.jpg (file) 586 KB Fig. M-3 -- Classification of the Mississippian System. 1
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