HUNT, LUCAS & HECKERT, 2001, 2002
Locaitly: Rainbow Forest Area, Flattops Sandstone 1, Flattops E Area, Petrified Forest, Apache County, Arizona.
Horizon: Upper Sonsela Sandstome Member, Petrified Forest Formation.
Age: Early Norian Stage, Late Triassic Epoch, Late Triassic.
Unnumbered: In situ: Anterior portion of a skull.
Note: The specimen is uncollectable (preserved underneath the cliff) but casts are preserved at the Mesalands Dinsoaur Museum and Petrified Forest National Park.