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• Devonian System
  |category2=Devonian System |tree22=Devonian System
  10 KB (1,478 words) - 17:18, 11 January 2017
• Cypress Sandstone
  |category2=Mississippian Subsystem |tree22=Mississippian Subsystem
  4 KB (640 words) - 20:03, 21 October 2019
• Baylis Formation
  |category2=Cretaceous System |tree22=Cretaceous System
  3 KB (482 words) - 17:09, 11 January 2017
• Grassy Creek Shale
  |category2=Devonian System |tree22=Devonian System
  4 KB (626 words) - 17:20, 11 January 2017
• Sweetland Creek Shale
  |category2=Devonian System |tree22=Devonian System
  4 KB (605 words) - 17:20, 11 January 2017
• Cretaceous System
  |category2=Cretaceous System |tree22=Cretaceous System
  9 KB (1,353 words) - 16:29, 11 January 2017
• Grand Tower Limestone
  |category2=Devonian System |tree22=Devonian System
  6 KB (817 words) - 19:34, 22 October 2019
• Pennsylvanian Subsystem
  ...ndbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p. ...in Illinois until about 50 years ago and since then has been regarded as a system (fig . P-2).
  24 KB (3,539 words) - 16:05, 20 January 2017
• Historical:Pennsylvanian System
  ...in Illinois until about 50 years ago and since then has been regarded as a system (fig . P-2). Strata of the Pennsylvanian System constitute the bedrock in about two-thirds of the area of Illinois (36,806
  24 KB (3,468 words) - 22:19, 19 January 2017
• Historical:Pennsylvanian Subsystem
  ...in Illinois until about 50 years ago and since then has been regarded as a system (fig . P-2). Strata of the Pennsylvanian System constitute the bedrock in about two-thirds of the area of Illinois (36,806
  24 KB (3,468 words) - 16:01, 20 January 2017
• Carbondale Formation
  ...22, Pennsylvanian Subsystem in Illinois: Illinois State Geological Survey, Bulletin (in press). ...of this basin resist being divided into formation-sized units. Unlike the Mississippian (for example), the Pennsylvanian lacks large, mappable bodies of rock that
  21 KB (3,121 words) - 16:14, 9 February 2022

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