|Geologic age||Pennsylvanian (Kasimovian)|
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Clastic > Mudstone > Shale (Bed, Carbonaceous)Shale can be silty and carbonaceous.
Sedimentary > Carbonate > Limestone (Bed)Limestone can be shaly or argillaceous.
Sedimentary > Coal (Bed)Coal bed is portrayed with underclay in northern Illinois.
|Comments||Thickness from stratigraphic columns: Bond Fm (0-350’) in southern Illinois (south of 40 degrees north latitude); Bond Fm (0-65’) in northern Illinois (north of 40 degrees north latitude). The Bond Formation is part of the McLeansboro Group; in southern Illinois it includes, from oldest to youngest, the Carthage Limestone, Mt. Carmel Sandstone, Flannigan Coal, and Millersville Limestone; and in northern Illinois, the Carthage Limestone, Hall Limestone, and La Salle Limestone.|
Kolata, D.R., comp., 2005, Bedrock Geology of Illinois: Champaign, Ill., Illinois State Geological Survey, Illinois Map Series 14, scale 1:500,000.
|Counties||Bond - Bureau - Champaign - Christian - Clark - Clinton - Coles - Crawford - Cumberland - De Witt - Douglas - Edgar - Edwards - Fayette - Ford - Franklin - Gallatin - Hamilton - Jasper - Jefferson - La Salle - Lawrence - Livingston - Logan - McLean - Macon - Macoupin - Madison - Marion - Marshall - Montgomery - Morgan - Perry - Piatt - Putnam - Saint Clair - Saline - Sangamon - Shelby - Vermilion - Wabash - Washington - White - Williamson - Woodford|