Woodford Shale  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Woodford Shale
RTDevonian
 Mississippian
 Oklahoma
SNDevonian and Mississippian. Upper part consists of alternating beds of black papery shale that weather light gray, and black chert in beds 1 to 4 inches thick. Central S and SE Oklahoma. Indexed with ages as applicable.