OKLAHOMA

GRANDY COUNTY

GR-2

CHICKASHA FORMATION

GUADALUPIAN SUBEPOCH

LOWER ZECHSTEIN EPOCH

EARLY LATE PERMIAN

STEM: TETRAPODA GOODRICH, 1930

SUPERCLASS: AMNIOTA HAECKEL, 1866

CLASS: REPTILIA LAURENTI, 1768

SUBCLASS: SYNAPSIDA OSBORN, 1903

ORDER: PELYCOSAURIA COPE, 1878

SUBORDER: CASEASAURIA WILLISTON, 1912

Incertae sedis

Gen sp indet.