LIST OF THE RICHARDS SPUR (FORT SILL) TETRAPOD PALEOFAUNA
Stratigraphic chart of the lower Permian (partial)
Content updated January 23, 2006
DIMETRODON
Synapsida-Eupelycosauria-Sphenacodontidae
Above: pictures of a sphenacodontid cervical vertebra (probably of a Dimetrodon) in lateral and ventral view. From Ryan Sandstone, Wellington Formation, near Waurika - Jefferson Co. Oklahoma. Lower Permian.