Douglas Group(Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Late [Virgilian])at surface, covers 13 % of this area
Lawrence FM (base LA)- mostly gray shale and sandstone with minor red shale, coal, gray limestone and conglomerate, thickness ranges from 140ft to 250 ft. Stranger FM- five members containing sandstone, shale, and minor limestone, coal and conglomerate ranging from 100 ft. to 180 ft. thickness.
Admire Group(Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Late)at surface, covers 11 % of this area
Includes: Grenola Limestone, Roca Shale, Red Eagle Limestone (base RE), Johnson Shale, Foraker Limestone (base FO), Janesville Shale with Five Point Limestone Member (base FP), Falls City Limestone, and Onaga Shale.
Chase Group(Phanerozoic | Paleozoic | Permian [Gearyan])at surface, covers 0.5 % of this area
Nolans Limestone- upper and lower limestone separated by shale, 40 ft thick. Odell Shale- mostly red and green shale, 40 ft. thick. Winfield Limestone (base WF)- cherty limestone with fossiliferous gray shale, 25 ft. thick. Doyle Shale- two shale members separated limestone, 70 ft. thick. Barneston Limestone (base BA)- two thick limestone members separated by thin limestone, 90 ft. thick: with Fort Riley Limestone Member( base FR)- gray to tan massive to thin bedded limestone with minor gray shale, 45 ft thick. Matfeild Shale- two varicolored shale members separated by limestone, 80 ft. thick. Wreford Limestone- two cherty limestone members separated shale, 40 ft. thick.