Stratigraphic chart of the lower Permian (partial)
Content updated October 16, 2005
THRAUSMOSAURUS SERRATIDENS
Synapsida-Incertae Sedis
Above: enlarged picture of the teeth of the same maxillary fragment showing the serration on the posterior edge of the teeth, near the base. From Richards Spur (Dolese Quarry) - Comanche Co. Oklahoma. Lower Permian.