Morrow Formation  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Carboniferous
 ....Pennsylvanian
 .....Morrow Formation
RTOklahoma
 Arkansas
 Morrowan
SNComposed of shales with some thin limestones and occasional sandstones. SE Arkansas, and central E and NE Oklahoma.