Illinois State Geological Survey Indiana Geological Survey Kentucky Geological Survey C V c KY. pId j--------- i- Illinois State Geological Survey Natural Resources Building 615 East Peabody Drive Champaign, IL 61820-6964 (217) 333-4747 Indiana Geological Survey ICentucky Geological Survey Please use the following citation when referencing this publication: Tri-State Committee on Correlation of the Pennsylvanian System in the Illinois Basin, 2001, Toward a More Uniform Stratigraphic Nomenclature for Rock Units (Formations and Groups) of the Pennsylvanian System in the Illinois Basin: Illinois Basin Consortium Study 5, Joint publication of the Illinois State Geological Survey, Indiana Geological Survey, and Kentucky Geological Survey, 26 p., 1 plate. Illinois Basin Consortium Study 5 A Joint Project of the tate Geological Indiana Geological Kentucky Geologic Abstract ............................................................................................................................................................. 1 Introduction ....................................................................................................................................................... 1 New Nomenclature for Formations and Groups of the Pennsylvanian System ............................................... 1 Raccoon Creek Group ....................................................................................................................................... 3 Definition and Justification ......................................................................................................................... 3 Historical Perspective ................................................................................................................................... 3 Caseyville Formation ..................................................................................................................................... 4 Definition and Justification .......................................................................................................................... 4 Historical Perspective ..................................... ... ........................................................................................ 4 Formation Boundaries ................................................................................................................................ 4 Thickness and Extent ................................................................................................................................ 5 Lithological Characteristics ........................................................................................................................ -6 Future Considerations .................................................................................................................................. 6 Tradewater Formation ..................................................................................................................................... 6 Definition and Justification ........................................................................................................................ 6 Historical Perspective ................................................................................................................................... 7 Formation Boundaries .................................................................................................................................. 7 Thickness and Extent ...................................................................................................................................7 Lithological Characteristics ......................................................................................................................... 8 Future Considerations ................................................................................................................................. 8 . Mansfield Formation (Indiana) ...................................................................................................................8 Brazil Formation (Indiana) ...............................................................................................................................9 Staunton Formation (Indiana) ........................................................................................................................ 9 Carbondale Group/Fomation ........................................................................................................................... 9 Definition and Justification ...................................................................................................................... 9 Historical Perspective .............................................................................................................................. 10 Boundaries .................................................................................................................................................11 Thickness and Extent .................................................................................................................................12 Lithological Characteristics .................................................................................................................12 Future Considerations ................................................................................................................................13 Linton Formation (Indiana) ............................................................................................................................ 13 tersburg Formation (Indiana) .................................................................................................................... 13 ugger Formation (Indiana) ...........................................................................................................................13 cleansboro Group ....................... .. ........................................................................................................ 13 Definition and Justification ....................................................................................................................... 13 Historical Perspective ................................................................................................................................ 14 helburn Formation ........................................................................................................................................15 Definition and Justification ...................................................................................................................... 15 Historical Perspective ................................................................................................................................. 15 Formation Boundaries ................................................................................................................................ 16 Thickness and Extent .................................................................................................................................1 Lithological Characteristics ..................................................................................................................... 16 Future Considerations ................................................................................................................................ 17 Patoka Formation ............................................................................................................................................17 Definition and Justification ........................................................................................................................ 17 Historical Perspective .................................................................................................................................17 Formation Boundaries ................................................................................................................................ 17 Thickness and Extent ................................................................................................................................ 17 Lithological Characteristics ...................................................................................................................... 18 Future Considerations .................................................................................................................. 18 Bond Formation .............................................................................................................................................. 18 Definition and Justification ........................................................................................................................ 18 Historical Perspective ................................................................................................................................. 18 Formation Boundaries ................................................................................................................................ 19 Thickness and Extent ................................................................................................................................. 19 Lithological Characteristics ....................................................................................................................... 19 Future Considerations 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