Holotype: UCMP 129618

Locality: Lacey Point Southwest 1 (Mesa Mount, “Dinosaur Hill”), PEFO 085106 (UCMP Loc. V82242, PF27, SMU 229), R24E, 35°2’46”N, 109°49’47”W, NW 1/4 of SE 1/4, Sec. 18, T 19N, R 24E, between 1st and 2nd Painted Desert Sandstones, Zuni Well Road Area, Petrified Forest, Apache County, Arizona.

Horizon: Upper Petrified Forest Formation.

Biostratigraphy:

Age: Revueltian, Early Norian Substage, Early Norian Epoch, Middle Late Triassic Epoch, Late Triassic.

Material: Ilia, fragmentary ischia, pubi, right femur, left tibia and fibula, right distal tarsals, and metatarsals III, IV, phalanges and fragmentary unguals, dorsal centrum, astragalus.

Referred material:

NESBITT, IRMIS, & PARKER, 2007

Locality: Petrified Forest National Monument, Apache County, Arizona.

Horizon: Petrified Forest Member, Chinle Group.

Biostratigraphy:

Age: Latest Carnian Stage, Late Triassic Epoch, Late Triassic.

Material:

PEFP 33981: Fragmentary skeleton with parts of the posterior vertebral column, pelvis and most of hindlimbs.

PEFP 33983: Most of the posterior portion of the skeleton.

PARKER & IRMIS, 2005

Locality: Giving Site (PFV 231), Petrified Forest National Monument, Apache County, Arizona.

Horizon: Petrified Forest Member, Chinle Group.

Biostratigraphy:

Age: Latest Carnian Stage, Late Triassic Epoch, Late Triassic.

Material:

PEFO Numbers not given: Partial skeletons of 3 individuals.

PEFO 22984: Small proximal femur.

Locality: Bowman Locality (PFV 89), Petrified Forest National Monument, Apache County, Arizona.

Horizon: Sonsela Member, Middle Petrified Forest Formation, Chinle Group.

Biostratigraphy:

Age: Latest Carnian Stage, Late Triassic Epoch, Late Triassic.

Material:

PEFO 31187: Proximal femur.