Pleasanton Group(Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Middle [Missourian])at surface, covers 4 % of this area
Includes: Shale Hill FM (base SH), and Hepler FM. Chiefly gray to very dark gray or yellowish gray shale with sandstone members and some limestone and coal.
Marmaton Group(Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Early [Desmoinesian])at surface, covers 56 % of this area
Includes: Lost Branch FM, Memorial Shale, Lenapah Limestone (base LE), Nowata Shale, Altamont Limestone (base PA), Bandera Shale, Pawnee Limestone (base PA), Labette Shale and Fort Scott Limestone.
Senora Formation(Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Middle)at surface, covers < 0.1 % of this area
TULSA- Shale with thin and lenticular sandstone, minor limestone, and coal. OKLAHOMA CITY- Mainly fine-grained micaceous sandstone and shale locally containing coal beds. Thickness ranges from about 500 to 950 feet. FORT SMITH- Shale, sandstone, and thin coal seams. ARDMORE-SHERMAN- Shale, gray, and light-brown medium-grained sandstone; thickness, 150 to 500 feet, decreasing southwestward. Subdivided into lower sandstone, 350 feet thick, and upper shale, 150 feet thick.
Cherokee Group(Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Early [Desmoinesian])at surface, covers 7 % of this area
Includes: Cabaniss FM (base CA) with Verdigris Limestone Member (base V) and Mineral coal bed (base MC), Krebs FM with Bluejacket Sandstone Member (base BJ) and Warner Sandstone Member (base WR).