Stratigraphic chart of the lower Permian (partial)
Content updated October 16, 2005
THRAUSMOSAURUS SERRATIDENS
Synapsida-Incertae Sedis
Above: picture of some Thrausmosaurus teeth, showing the very angular curvature in the distal third of the tooth. From Richards Spur (Dolese Quarry), Comanche Co. - Oklahoma. Lower Permian