Stratigraphic chart of the lower Permian (partial)
Content updated October 16, 2005
OPHIACODON
Synapsida-Eupelycosauria-Ophiacodontidae
Above: picture, in medial view, of the caniniform region of Ophiacodon maxilla showing the ascending process (AP) of supracanine buttress. From Ryan Sandstone, Wellington Formation, near Waurika - Jefferson Co. Oklahoma. Lower Permian.