LIST OF THE RICHARDS SPUR (FORT SILL) TETRAPOD PALEOFAUNA
Stratigraphic chart of the lower Permian (partial)
Content updated April 10, 2006
DIMETRODON
Synapsida-Eupelycosauria-Sphenacodontidae
Above: picture of the same sphenacodontid partial pelvis (probably of a Dimetrodon) in medial view. From Ryan Sandstone, Wellington Formation, near Waurika - Jefferson Co. Oklahoma. Lower Permian.
Abbreviations: ESR, excavation of the ilium that receive the sacral rib