Atoka Formation  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Carboniferous
 ....Pennsylvanian
 .....Middle Pennsylvanian
 ......Atokan
 .......Atoka Formation
RTOklahoma
 Arkansas
SNSandstone members: Coody (Coata), Pope Chapel, Georges Fork, Dirty Creek, Webbers Falls, and Blackjack School. Subdivided, in Arkansas, to include Greenland Sandstone Member at base.