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Date Name Thumbnail Size User Description Versions
19:35, 1 April 2016 Figure 13.jpg (file) 574 KB ILSTRAT Fig. 13 -- Geologic cross section along the lines shown in figure 12 (after Willman er al., 1967). 1
15:57, 1 April 2016 Figure 11.jpg (file) 1.89 MB ILSTRAT 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
15:54, 1 April 2016 Figure 9.jpg (file) 895 KB ILSTRAT Fig. 9 -- Index map showing counties and townships. 1
15:53, 1 April 2016 Figure 8.jpg (file) 834 KB ILSTRAT Fig. 8 -- Topography and rivers of Illinois. 1
15:52, 1 April 2016 Figure 7.jpg (file) 762 KB ILSTRAT Fig. 7 -- Physiographic divisions of Illinois (after Leighton et al., 1948). 1
15:51, 1 April 2016 Figure 6.jpg (file) 344 KB ILSTRAT Fig. 6 -- Geologic map of Illinois by Stuart Weller (1907). 1
15:50, 1 April 2016 Figure 5.jpg (file) 350 KB ILSTRAT Fig. 5 -- Geologic map of Illinois by A. H. Worthen (1875). 1
15:49, 1 April 2016 Figure 4.jpg (file) 274 KB ILSTRAT Fig. 4 -- Index to volumes issued by the Geological Survey of Illinois (Worthen Survey) in which individual counties are described. 1
15:46, 1 April 2016 Figure 3.jpg (file) 273 KB ILSTRAT Fig. 3 -- Geologic map of Illinois by James Hall (1843). 1
15:42, 1 April 2016 Figure P-16.jpg (file) 320 KB Illex-gron Fig. P-16 -- Thickness of the Mattoon Formation (based on map by K. E. Clegg). 1
15:41, 1 April 2016 Figure P-15.jpg (file) 457 KB Illex-gron Fig. P-15 -- Thickness of the Bond Formation (based on map by K. E. Clegg). 1
15:39, 1 April 2016 Figure P-14.jpg (file) 535 KB Illex-gron Fig. P-14 -- Thickness of the Modesto Formation (based on map by K. E. Clegg). 1
15:38, 1 April 2016 Figure P-10.jpg (file) 507 KB Illex-gron Fig. P-10 -- Combined thickness of the Caseyville, Abbott, and Spoon Formations (after Walness, 1955) 1
15:36, 1 April 2016 Figure P-8.jpg (file) 714 KB Illex-gron Fig. P-8 -- Structure of the top of the Herrin (No. 6) Coal Member (based on map by K. E. Clegg). 1
15:31, 1 April 2016 Figure P-7.jpg (file) 276 KB Illex-gron Fig. P-7 -- Arrangement of lithologic units in a cyclothem (after Willman and Payne, 1942). 1
15:27, 1 April 2016 Figure P-1.jpg (file) 753 KB Illex-gron Fig. P-1 -- Thickness of the Pennsylvanian System. 1
15:09, 1 April 2016 Figure P-2.jpg (file) 765 KB Illex-gron Reverted to version as of 14:45, 5 August 2015 3
14:55, 1 April 2016 Figure P-9.jpg (file) 334 KB Illex-gron Fig. P-4 -- Extent of the Caseyville Formation (after Wanless, 1955). 1
14:50, 1 April 2016 Figure P-3A.jpg (file) 566 KB Illex-gron Fig. P-3A -- Battery Rock Sandstone Member of the Caseyville Formation capping an escarpment 8 miles north of Cave in Rock, Hardin County. 2
14:29, 1 April 2016 Figure 12.jpg (file) 808 KB Illex-gron Fig. 12 -- Principal geologic structures of Illinois. 1
16:31, 31 March 2016 Figure O-2A.jpg (file) 444 KB ILSTRAT 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
16:24, 31 March 2016 Figure 1.jpg (file) 661 KB ILSTRAT Fig. 1 -- Summary of the age, origin, and thickness of Illinois rocks. 1
23:20, 8 March 2016 Penn carb fig2.jpg (file) 1.26 MB IlLex   1
19:15, 8 March 2016 Penn carb fig65.jpg (file) 1.22 MB IlLex "Blue band" at Francisco Mine portal where Herrin Coal is reduced to streaks 1
19:14, 8 March 2016 Penn carb fig64.jpg (file) 1.39 MB IlLex Photograph of hand speciman of "Blue band" 1
19:07, 8 March 2016 Penn carb fig63.jpg (file) 665 KB IlLex Graphic Log of part of continuous core from Madison Coal Corp. borehole #25 in Williamson County. Reference section for Herrin Coal. 1
17:06, 8 March 2016 Penn carb fig3.jpg (file) 905 KB IlLex Correlation chart. Primary sources: Peppers (1996), Hickel (2013). No Scale 1
16:57, 8 March 2016 Penn carb fig1.jpg (file) 276 KB IlLex Chart Showing the Development of the Stratigraphic Classification of the Pennsylvanian System in the Illinois Basin. Compiled by the Tri-State Committee on Correlation of the Pennsylvanian System in the Illinois Basion, 2001. 1
14:04, 15 January 2016 Penn symbol.png (file) 16 KB IlLex Pennsylvanian Geo Unit Designation symbol 1
13:45, 15 January 2016 Cambrian symbol.png (file) 16 KB IlLex Symbol Used for the Cambrian Geo Unit Designation 1
20:03, 14 October 2015 Figure P-6.jpg (file) 1.5 MB IlLex Fig. P-6 -- Typical Pennsylvanian fossils 1
19:35, 14 October 2015 Figure 10.jpg (file) 1.61 MB IlLex Fig. 10 -- Generalized areal geology of the bedrock surface (Willman and Frye, 1970) 1
19:28, 14 October 2015 Figure P-4.jpg (file) 1.15 MB IlLex P-4 -- Geologic map of the sub-Pennsylvanian (sub-Absaroka) surface (after Willman et al., 1967) 1
19:03, 14 October 2015 Figure P-3C.jpg (file) 1.41 MB IlLex P-3C -- Mecca Quarry Shale Member (M) of the Carbondale Formation in which a large limestone concretion is present (at the hammer), overlying the Colchester (No. 2) Coal Member (C) just south of Viola, Mercer County. 1
18:40, 14 October 2015 Figure P-3F.jpg (file) 1.61 MB IlLex P-3F -- Quartz-pebble conglomerate in the Caseyville Formation near Shiloh Hill, Randolph County. 1
18:39, 14 October 2015 Figure P-3E.jpg (file) 1.82 MB IlLex P-3E -- Asymmetrical current ripple marks and weak current laminations (parallel to hammer) in thin-bedded sandstone in the Caseyville Formation, near Pomona, Jackson County. 1
18:35, 14 October 2015 Figure P-3D.jpg (file) 1.38 MB IlLex P-3D -- The Sub-Absaroka unconformity showing Pennsylvanian strata (Caseyville Formation) truncating Mississippian strata (Kinkaid Limestone) in a roadcut of U.S. Highway 51, north of Anna, Union County. 1
18:30, 14 October 2015 Figure P-3B.jpg (file) 2.11 MB IlLex P-3B -- Strata overlying the Herrin (No. 6) Coal Member of the Carbondale Formation (at the man's feet), including the Bankston Fork Limestone Member (BF), Conant Limestone Member (C), Jamestown Coal Member (J, 1 inch thick), gray calcareous shale (gs)... 1
16:24, 1 October 2015 B104.jpg (file) 29 KB IlLex   1
16:15, 1 October 2015 B94.jpg (file) 18 KB IlLex   1
19:38, 13 August 2015 B95.jpg (file) 20 KB Alan Myers   1
17:54, 10 August 2015 Geologic-time-scale1.jpg (file) 67 KB Alan Myers   1
16:57, 10 August 2015 Pennsylvanian column update.jpg (file) 1.91 MB Alan Myers   1
16:12, 10 August 2015 Pennsylvanian column.jpg (file) 1.13 MB Alan Myers Pennsylvanian Column test 1
15:02, 6 August 2015 Figure K-2.jpg (file) 275 KB Alan Myers Fig. K-2 -- Classification of the Cretaceous System 1
20:09, 5 August 2015 ISGS logo.jpg (file) 178 KB Alan Myers   1
14:43, 5 August 2015 Figure P-5.jpg (file) 684 KB Alan Myers Fig. P-5 -- Development of Classification of the Pennsylvanian System) 1
14:42, 5 August 2015 Figure P-11.jpg (file) 554 KB Alan Myers Fig. P-11 -- Thickness of the Carbondale Formation (based on map by K.E. Clegg). 1
14:41, 5 August 2015 Figure P-12.jpg (file) 640 KB Alan Myers Fig. P-12 -- Thickness of the Harrisburg (No.5) and Springfield (No. 5) Coal Members (based on may by K.E. Glegg). 1
13:34, 5 August 2015 Figure P-13.jpg (file) 614 KB Alan Myers Fig. P-13 -- Thickness of the Herrin (No. 6) Coal Member (based on map by K.R. Clegg) 1
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