Stratigraphic chart of the lower Permian (partial)
Content updated October 16, 2005
RICHARDS SPUR DIAPSID ARAEOSCELID?
Eureptilia-Diapsida-Araeoscelidae
Above: pictures of a maxilla fragment, in medial view, that could belong to a Diapsid for the presence of a distinct process that is the sutural surface for the palatine (plss), posteriorly to this process the alveolar shelf become smooth and forms the lateral margin of the suborbital fenestra (msf). From Richards Spur (Dolese Quarry), Comanche Co. Oklahoma. Lower Permian
Abbreviations: lass, sutural surface for lacrimal; msf, margin of suborbital fenestra; plss, sutural surface for the palatine;