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(newest | oldest) View (newer 100 | older 100) (20 | 50 | 100 | 250 | 500)- 15:07, 8 April 2016 Jennifer.Obrad talk contribs deleted page Yorkville Till Member (Bulletin 94) (content was: "{{B94}} {{Tree |category1=Cenozoic Erathem |category2=Quaternary System |category3=Pleistocene Series |category4=Wedron Formation |tree1=Cenozoic Erathem (Bulletin 95..." (and the only contributor was "IlLex"))
- 20:32, 7 April 2016 Jennifer.Obrad talk contribs deleted page Haeger Till Member (Bulletin 94) (content was: "{{B94}} {{Tree |category1=Cenozoic Erathem |category2=Quaternary System |category3=Pleistocene Series |category4=Wedron Formation |tree1=Cenozoic Erathem (Bulletin 95..." (and the only contributor was "IlLex"))
- 19:52, 7 April 2016 Jennifer.Obrad talk contribs moved page Category:Mesozoic to Category:Mesozoic Erathem without leaving a redirect
- 19:51, 7 April 2016 Jennifer.Obrad talk contribs moved page Search:Mesozoic to Search:Mesozoic Erathem without leaving a redirect
- 19:49, 7 April 2016 Jennifer.Obrad talk contribs moved page Category:Cretaceous to Category:Cretaceous System without leaving a redirect
- 19:47, 7 April 2016 Jennifer.Obrad talk contribs moved page Search:Cretaceous to Search:Cretaceous System without leaving a redirect
- 19:22, 7 April 2016 Jennifer.Obrad talk contribs moved page Search:Tertiary to Search:Tertiary System without leaving a redirect
- 19:20, 7 April 2016 Jennifer.Obrad talk contribs moved page Category:Tertiary to Category:Tertiary System without leaving a redirect
- 14:41, 7 April 2016 Jennifer.Obrad talk contribs deleted page Wadsworth Till Member (Bulletin 94) (content was: "{{B94}} {{Tree |category1=Cenozoic Erathem |category2=Quaternary System |category3=Pleistocene Series |category4=Wedron Formation |tree1=Cenozoic Erathem (Bulletin 95..." (and the only contributor was "IlLex"))
- 21:21, 6 April 2016 Jennifer.Obrad talk contribs deleted page 780 (content was: "#REDIRECT 0780" (and the only contributor was "IlLex"))
- 21:16, 6 April 2016 Jennifer.Obrad talk contribs deleted page 0170 (content was: "#REDIRECT Wisconsinan Stage (Bulletin 94)" (and the only contributor was "IlLex"))
- 21:15, 6 April 2016 Jennifer.Obrad talk contribs deleted page 1150 (content was: "#REDIRECT Nebraskan Stage (Bulletin 94)" (and the only contributor was "IlLex"))
- 21:15, 6 April 2016 Jennifer.Obrad talk contribs deleted page 1140 (content was: "#REDIRECT Kansan Stage (Bulletin 94)" (and the only contributor was "IlLex"))
- 20:35, 6 April 2016 Jennifer.Obrad talk contribs deleted page Wedron Formation (B104) (content was: "{{B104}} {{Tree |tree1=Cenozoic Erathem |tree2=Quaternary System |tree3=Pleistocene Series |tree4=Wedron Formation (B104) |category1=Cenozoic Erathem |categor..." (and the only contributor was "IlLex"))
- 20:33, 6 April 2016 Jennifer.Obrad talk contribs deleted page Wedron Formation (Bulletin 94) (content was: "{{B94}} {{Tree |category1=Cenozoic Erathem |category2=Quaternary System |category3=Pleistocene Series |tree1=Cenozoic Erathem (Bulletin 95) |tree2=Quaternary System (..." (and the only contributor was "IlLex"))
- 19:42, 6 April 2016 Jennifer.Obrad talk contribs moved page Search:Triasic to Search:Triassic without leaving a redirect
- 19:34, 6 April 2016 Jennifer.Obrad talk contribs deleted page Henry Formation (Bulletin 94) (content was: "{{B94}} {{Tree |category1=Cenozoic Erathem |category2=Quaternary System |category3=Pleistocene Series |tree1=Cenozoic Erathem (Bulletin 95) |tree2=Quaternary System (..." (and the only contributor was "IlLex"))
- 18:53, 6 April 2016 Jennifer.Obrad talk contribs deleted page Equality Formation (Bulletin 94) (content was: "{{B94}} {{Tree |category1=Cenozoic Erathem |category2=Quaternary System |category3=Pleistocene Series |tree1=Cenozoic Erathem (Bulletin 95) |tree2=Quaternary System (..." (and the only contributor was "IlLex"))
- 15:42, 6 April 2016 Jennifer.Obrad talk contribs deleted page Lemont Drift (Bulletin 94) (content was: "{{B94}} {{Tree |category1=Cenozoic Erathem |category2=Quaternary System |category3=Pleistocene Series |category4=Lemont Drift |tree1=Cenozoic Erathem (Bulletin 95) |t..." (and the only contributor was "IlLex"))
- 14:30, 6 April 2016 Jennifer.Obrad talk contribs moved page Peddicord Tounge (Bulletin 104) to Peddicord Tongue (Bulletin 104) without leaving a redirect
- 22:07, 5 April 2016 Jennifer.Obrad talk contribs deleted page Lake Michigan Formation (Bulletin 94) (content was: "{{B94}} {{Tree |category1=Cenozoic Erathem |category2=Quaternary System |category3=Pleistocene Series |category4=Equality Formation |tree1=Cenozoic Erathem (Bulletin..." (and the only contributor was "IlLex"))
- 20:58, 5 April 2016 Jennifer.Obrad talk contribs moved page Beverly Tounge (Bulletin 104) to Beverly Tongue (Bulletin 104) without leaving a redirect
- 20:25, 5 April 2016 Jennifer.Obrad talk contribs moved page Ashmore Tounge (Bulletin 104) to Ashmore Tongue (Bulletin 104) without leaving a redirect
- 16:24, 5 April 2016 Alan.Myers talk contribs uploaded a new version of File:Figure Q-1C.jpg (Fig. Q-1C -- Wisconsinan Peoria Loess (P) overlying the Roxana Silt (Rm-Meadow Loess Member, Rmc-McDonough Loess Member) and the Illinoian Teneriffe Silt (T) in the Pleasant Grove School Section in the Mississippi River bluffs northwest of Collinsville...)
- 16:12, 5 April 2016 Alan.Myers talk contribs uploaded a new version of File:Figure Q-1B.jpg (Fig. Q-1B -- The Wisconsinan Wedron (W-interbedded till and outwash) and Peddicord (P-lake sediments) Formations overlying till of the Illinoian Glasford Formation in the Wedron Silica Company pit at Wedron, LaSalle County-the type sections of the Wedr...)
- 16:02, 5 April 2016 Alan.Myers talk contribs uploaded a new version of File:Figure Q-1A.jpg (Fig. Q-1A -- Wisconsinan Richland Loess (R), Delavan Till Member of the Wedron Formation (Wd), Morton Loess(M), Robein and Roxana Silts (RR), and the Sangamon Soil (S) on till of the Illinoian Glasford Formation(C); in a railroad cut a mile east of Far...)
- 15:05, 5 April 2016 User account Illex-gron talk contribs was created by Alan.Myers talk contribs
- 15:04, 5 April 2016 User account Unknown user talk was created by Alan.Myers talk contribs
- 14:56, 5 April 2016 Jennifer.Obrad talk contribs deleted page Peoria Loess (Bulletin 94) (content was: "{{B94}} {{Tree |category1=Cenozoic Erathem |category2=Quaternary System |category3=Pleistocene Series |tree1=Cenozoic Erathem (Bulletin 95) |tree2=Quaternary System (..." (and the only contributor was "IlLex"))
- 13:22, 5 April 2016 Alan.Myers talk contribs uploaded File:Figure S-2F.jpg (Fig. S-2F -- Dense, argillaceous dolomite containing chert nodules characteristic of Racine interreef facies in the Chicago area. The outer, porous parts of the nodules are blackened by air pollutants.)
- 13:16, 5 April 2016 Alan.Myers talk contribs uploaded File:Figure S-2E.jpg (Fig. S-2E -- Mottled, porous, pure dolomite characteristic of Racine reef facies in the Chicago area (x 1).)
- 13:16, 5 April 2016 Alan.Myers talk contribs uploaded File:Figure S-2D.jpg (Fig. S-2D -- Massive Tete des Morts Formation overlying the Mosalem Formation at the top of Silurian escarpment, 4 miles southeast of Galena, Jo Daviess County.)
- 13:15, 5 April 2016 Alan.Myers talk contribs uploaded File:Figure S-2C.jpg (Fig. S-2C -- Massive Marcus Dolomite in a quarry 3 miles east of Fulton, Whiteside County.)
- 13:14, 5 April 2016 Alan.Myers talk contribs uploaded File:Figure S-2B.jpg (Fig. S-2B -- Steeply dipping, well bedded dolomite forming the fiank of a Racine (Niagaran) reef, in the Material Service Corporation quarry at Thornton, Cook County.)
- 13:14, 5 April 2016 Alan.Myers talk contribs uploaded File:Figure S-2A.jpg (Fig. S-2A -- Massive dolomite in the core of a Racine (Niagaran) reef, at the top of the Material Service Corporation (Stearns) quarry on Archer Avenue at 28th Street, Chicago.)
- 13:12, 5 April 2016 Alan.Myers talk contribs uploaded File:Figure Q-1F.jpg (Fig. Q-1F -- Harkness Silt Member of the ~ansan Banner Formation (Bh) overlying the Afton Soil developed on gravel of the Nebraskan Enion Formation (AE); in a roadcut at the Zion Church, 2 miles southeast of Marblehead, Adams County (Willman and Frye,...)
- 13:11, 5 April 2016 Alan.Myers talk contribs uploaded File:Figure Q-1E.jpg (Fig. Q-1E -- Wisconsinan Roxana Silt (R), Sangamon Soil developed in the Illinoian Loveland Silt (SL) and Yarmouth Soil developed in till of the Kansan Banner Formation (YB); in a roadcut at Independence, 5 miles south of Pittsfield, Pike County (Frye...)
- 13:10, 5 April 2016 Alan.Myers talk contribs uploaded File:Figure Q-1D.jpg (Fig. Q-1D -- Illinoian Glasford Formation (Hagarstown Member) showing steeply dipping sand and gravel (crevasse deposit) in a mound in the Kaskaskia Ridged Drift area, 2 miles southwest of Lakewood, Shelby County.)
- 13:09, 5 April 2016 Alan.Myers talk contribs uploaded File:Figure Q-1C.jpg (Fig. Q-1C -- Wisconsinan Peoria Loess (P) overlying the Roxana Silt (Rm-Meadow Loess Member, Rmc-McDonough Loess Member) and the Illinoian Teneriffe Silt (T) in the Pleasant Grove School Section in the Mississippi River bluffs northwest of Collinsville...)
- 21:47, 4 April 2016 Jennifer.Obrad talk contribs moved page Omphghent Till Member to Omphghent member without leaving a redirect
- 21:38, 4 April 2016 Jennifer.Obrad talk contribs moved page Crowleys's Ridge Silt (Bulletin 94) to Crowley's Ridge Silt without leaving a redirect
- 21:30, 4 April 2016 Jennifer.Obrad talk contribs moved page Alburnett Formation (Bulletin 94) to Alburnett Formation without leaving a redirect
- 21:08, 4 April 2016 Jennifer.Obrad talk contribs moved page County Line (Alburnett) Silt to County Line (Alburnett) silt without leaving a redirect
- 21:05, 4 April 2016 Jennifer.Obrad talk contribs moved page Mascoutah Facies to Mascoutah facies without leaving a redirect
- 20:59, 4 April 2016 Jennifer.Obrad talk contribs moved page Canteen Member to Canteen member without leaving a redirect
- 20:57, 4 April 2016 Jennifer.Obrad talk contribs moved page Grigg Tongue to Grigg tongue without leaving a redirect
- 20:52, 4 April 2016 Jennifer.Obrad talk contribs moved page Grigg Tounge to Grigg Tongue without leaving a redirect
- 20:48, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure Q-1B.jpg (Fig. Q-1B -- The Wisconsinan Wedron (W-interbedded till and outwash) and Peddicord (P-lake sediments) Formations overlying till of the Illinoian Glasford Formation in the Wedron Silica Company pit at Wedron, LaSalle County-the type sections of the Wedr...)
- 20:25, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure Q-1A.jpg (Fig. Q-1A -- Wisconsinan Richland Loess (R), Delavan Till Member of the Wedron Formation (Wd), Morton Loess(M), Robein and Roxana Silts (RR), and the Sangamon Soil (S) on till of the Illinoian Glasford Formation(C); in a railroad cut a mile east of Far...)
- 20:22, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure O-2F.jpg (Fig. O-2F -- Thin-bedded dolomite of the Quimbys Mill Formation overlying massive dolomite of the Nachusa Formation in a quarry on River Street in Dixon, Lee County.)
- 20:21, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure O-2E.jpg (Fig. O-2E -- Massice Oneota Dolomite containing a large algal growth; in a quarry in Lee County, 6 Miles south of Rochelle, Ogle County.)
- 20:19, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure O-2D.jpg (Fig. O-2D -- Relatively thin-bedded Platteville Limestone Group showing the Nashusa (N), Grand Detour (GD), and Mifflin (M) Formations overlying the thick-bedded Joachim Dolomite (J) in a quarry at West Point Landing, Calhoun County (Templeton and Will...)
- 20:17, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure O-2C.jpg (Fig. O-2C -- Massive Wise Lake Formation overlying the thinner bedded Dunleith Formation, which contains lenses and beds of white chert, in a quarry on the south side of Freeport, Stephenson County.)
- 20:14, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure O-2B.jpg (Fig. O-2B -- Type section of Dunleith Formation showing the Mortime (Mo), Rivoli (Ri), Sherwood (Sh), Wall (Wa) and Wyota (Wy) Members overlain by the Sinsinawa Member (Si) of the Wise Lake Formation at East Dubuque, Jo Daviess County (Templeton and Wi...)
- 18:55, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure M-1F.jpg (Fig. M-1F -- Grannular texture of the Ullin Limestone along Mill Creek, south of Anna, Union County (x1).)
- 18:54, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure M-1E.jpg (Fig. M-1E -- Oolitic texture of the Ste. Genevieve Limestone at Anna, Union County (x10).)
- 18:52, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure M-1D.jpg (Fig. M-1D -- Well bedded St. Louis Limestone with cave in its base overlying massive Salem Limestone in Mississippi River bluff a mile northwest of Prairie du Rocher, Randolph County.)
- 18:50, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure M-1C.jpg (Fig. M-1C -- Kinkaid Limestone showing clay-filled solution cavity in the Goreville Member at the top overlying a layer of shale with red bed (black) at the tope of the Cave Hill Member; in Southern Illinois Limestone Company quarry north of Buncombe,...)
- 18:46, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure M-1B.jpg (Fig. M-1B -- Massive Ste. GEnevieve Limestone overlying well bedded St. Louis Limestone in Mississippi River bluff (about 60 feet high) on northwest side of Alton, Madison County.)
- 18:44, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure M-1A.jpg (Fig. M-1A -- Vienna Limestone overlying the sheet facies of the Tar Springs Sandstone in roadcut (about 40 feet high) of Illinois Highway 3 on southeast side of Chester, Randolph County.)
- 18:38, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure K-1C.jpg (Fig. K-1C -- Bedding surface of Mounds Gravel in same pit as exposure B (x1.5).)
- 18:37, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure K-1B.jpg (Fig. K-1B -- Mounds Gravel in pit along Illinois Highway 145, 8 miles north of Metropolis, Massac County.)
- 18:35, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure K-1A.jpg (Fig. K-1A -- McNairy Sand in a pit near Fayville, Alexander County.)
- 18:33, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure D-3E.jpg (Fig. D-3E -- Dark gray, fine-grained Middle Devovian limestone containing white corals; polished section of core from depth of 3270 feet in Marion County (x1).)
- 18:31, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure D-3D.jpg (Fig. D-3D -- Fine-grained, fossiliferous limestone characteristic of Cedar Valley Limestone in the Rock Island area, Rock Island County (x1).)
- 18:29, 4 April 2016 Alan.Myers talk contribs uploaded a new version of File:Figure D-3C.jpg (Fig. D-3C -- Cedar Valley (CV) and Wapsipinicon (W) Limestone in Collinson Stone Company Quarry, 1 mile southeast of Milan, Rock Island County. The Rock face is about 70 feet high.)
- 18:24, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure D-3C.jpg (Fig. D-3C -- Cedar Valley (CV) and Wapsipinicon (W) Limestone in Collinson Stone Company Quarry, 1 mile southeast of Milan, Rock Island County. The Rock face is about 70 feet high.)
- 18:22, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure D-3B.jpg (Fig. D-3B -- Bailey Limestone in Pine Hills (Mississippi River bluffs), 5 miles north of Wolf Lake, Union County.)
- 18:21, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure D-3A.jpg (Fig. D-3A -- Middle Devonian Limestone (Lingle and Grand Tower) in ridge ("the Backbone") along the Mississippi River north of Grand Tower, Jackson County (from Worthen, 1868, opp. p. 61).)
- 18:18, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure C-1D.jpg (Fig. C-1D -- Core of Ironton Sandstone showing flat-pebble conglomerate; from boring in Champaign county (x2).)
- 18:17, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure C-1C.jpg (Fig. C-1C -- Core of Eau Clair Formation showing penecontemporaneous deformation of shale beds in shaly sanstone; from a boring in Champaign County (x2).)
- 18:15, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure C-1B.jpg (Fig. C-1B -- Cambrian-Ordovician unconformity showing well bedded Oneota Dolomite overlying massive Potosi Dolomite in a quarry in Lee County, 6 miles south of Rochelle, Ogle County (Willman and Templeton, 1951, p. 113).)
- 18:12, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure C-1A.jpg (Fig. C1-A -- Massive Potosi Dolomite in a quarry 4 miles northwest of Ashton, Ogle County.)
- 18:09, 4 April 2016 Alan.Myers talk contribs uploaded File:Table 3.jpg (Table 3 -- Alphabetic list of named cyclothems in Illinois, showing formation, distribution, and principal references (after Kosanke et al., 1960).)
- 18:07, 4 April 2016 Alan.Myers talk contribs uploaded File:Table 2.jpg (Table 2 -- Illinois Mineral Production in 1972 (Malhotra, 1974).)
- 18:06, 4 April 2016 Alan.Myers talk contribs uploaded File:Table 1.jpg (Table 1 -- Source Rocks of Illinois Mineral Resources.)
- 18:05, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure T-2.jpg (Fig. T-2 -- Classification of the Tertiary System.)
- 18:04, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure T-1.jpg (Fig. T-1 -- Distribution of the Mounds and Grover Gravels.)
- 18:02, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure S-16.jpg (Fig. S-16 -- Electric log of the Silurian System.)
- 18:00, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure S-15.jpg (Fig. S-15 -- Thickness of teh Niagaran Series; includes the Cayugan Series in southern Illinois.)
- 17:59, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure S-14.jpg (Fig. S-14 -- Thickness of the Alexandrian Series.)
- 17:58, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure S-13.jpg (Fig. S-13 -- Thickness of the Hunton Limestone Megagroup (modified from Bond et al., 1971).)
- 17:57, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure S-12.jpg (Fig. S-12 -- Typical Silurian fossils.)
- 17:56, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure S-11.jpg (Fig. S-11 -- North-south cross section of the Silurian System.)
- 17:56, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure S-10.jpg (Fig. S-10 -- Development of the classification of the Silurian System in southern Illinois.)
- 17:55, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure S-9.jpg (Fig. S-9 -- Development of the classification of the Silurian System in western Illinois.)
- 17:54, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure S-8.jpg (Fig. S-8 -- Development of the classification of the Silurian System in northwestern Illinois.)
- 17:53, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure S-7.jpg (Fig. S-7 -- Development of the classification of the Silurian System in northeastern Illinois.)
- 17:52, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure S-6.jpg (Fig. S-6 -- Columnar section of Silurian System in southern Illinois.)
- 17:11, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure S-5.jpg (Fig. S-5 -- Columnar section of the Silurian System in western Illinois.)
- 17:03, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure S-4.jpg (Fig. S-4 -- Columnar section of the Silurian System in northwestern Illinois.)
- 17:03, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure S-3.jpg (Fig. S-3 -- Columnar section of Silurian System in northeastern Illinois.)
- 17:02, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure S-1.jpg (Fig. S-1 -- Silurian System thickness, outcroup areas, nomenclature boundary, and reef in the Moccasin Springs Formation.)
- 16:00, 4 April 2016 Alan.Myers talk contribs uploaded a new version of File:Figure Q-10.jpg (Fig. Q-10 -- Woodfordian glacial moraines in Illinois (Willman and Frye, 1970).)
- 15:59, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure Q-10.jpg (Fig. Q-10 -- Woodfordian glacial moraines in Illinois (Willman and Frye, 1970).)
- 15:58, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure Q-9.jpg (Fig. Q-9 -- Woodfordian lobes and sublobes in Illinois (Willman and Frye, 1970).)
- 15:56, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure Q-8.jpg (Fig. Q-8 -- Diagrammatic cross section showing the relations of the formations and members of Wisconsinan age in northern and western Illinois (Willman and Frye, 1970).)
- 15:55, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure Q-7.jpg (Fig. Q-7 -- Diagrammatic cross section showing the relations of the formations and members of Illinoian age in central and western Illinois (Willman and Frye, 1970).)
- 15:53, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure Q-6.jpg (Fig. Q-6 -- Development of classification of the Wisconsinan Stage in Illinois.)
- 15:53, 4 April 2016 Alan.Myers talk contribs uploaded File:Figure Q-5.jpg (Fig. Q-5 -- Areal distribution of the dominantly till formations and members of Illinois (after Willman and Frye, 1970; Johnson et al., 1972).)