 This skull was collected about one mile west of the former Woodrum ranch-house, in Early Permian sediments of the Artinskian-lower Kungurian Belle Plains Formation, Wichita Group, south of Dundee, Archer County, Texas, USA.in rocks which are about 275 million years old.The generic name is Greek for "dawn opening", likely in reference for its status as one of the most primitive known synapsids.