|Geologic age||Pennsylvanian (Bashkirian to Moscovian)|
Sedimentary > Clastic > Mudstone > Shale (Bed, Carbonaceous)Shale can be silty and carbonaceous.
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Carbonate > Limestone (Bed)
Sedimentary > Coal (Bed)Coal beds are portrayed with underclays.
|Comments||Thickness from stratigraphic columns: Tradewater Fm (0-650’) in southern Illinois (south of 40 degrees north latitude); Tradewater Fm (0-195’) in northern Illinois (north of 40 degrees north latitude). The Tradewater Formation represents the upper part of the Raccoon Creek Group. The Tradewater Formation in southern Illinois includes, from oldest to youngest, the Reynoldsburg Coal, Bell Coal, "3rd and 4th Siggins", "Mansfield", "Casey", Rock Island Coal, Curlew Limestone, Delwood Coal, Murphysboro Coal, Mt. Rorah Coal, Stonefort Limestone, and Carrier Mills Shale, and in northern Illinois, only includes the Rock Island Coal. [Oil well drillers' terms shown in quotation marks.]|
|Stratigraphic units||Reynoldsburg Coal, Bell Coal, "3rd and 4th Siggins", "Mansfield", "Casey", Rock Island Coal, Curlew Limestone, Delwood Coal, Murphysboro Coal, Mt. Rorah Coal, Stonefort Limestone, Carrier Mills Shale|
Kolata, D.R., comp., 2005, Bedrock Geology of Illinois: Champaign, Ill., Illinois State Geological Survey, Illinois Map Series 14, scale 1:500,000.
|Counties||Adams - Brown - Bureau - Calhoun - Cass - Champaign - Douglas - Ford - Fulton - Gallatin - Greene - Grundy - Hancock - Hardin - Henderson - Henry - Iroquois - Jackson - Jersey - Johnson - Kankakee - Kendall - Knox - La Salle - Lee - Livingston - Logan - McDonough - McLean - Macoupin - Madison - Mason - Mercer - Monroe - Morgan - Peoria - Perry - Piatt - Pike - Pope - Randolph - Rock Island - Saint Clair - Saline - Schuyler - Scott - Tazewell - Union - Vermilion - Warren - Whiteside - Will - Williamson|