Stratigraphic chart of the lower Permian (partial)
Content updated October 16, 2005
RICHARDS SPUR UNIDENTIFIED
PELYCOSAUR
Above: picture in lateral view of a vertebra of an unidentified pelycosaur, of note is the deeply excavated base of neural spine. From Richards Spur (Dolese Quarry) - Comanche Co. Oklahoma. Lower Permian