Holotype:

Locality: Fruita Paleontological Area, locality 4684, Mesa County, Colorado.

Horizon: Brushy Basin Member, Morrison Formation.

Biostratigraphy: Zone 4.

Age: Upper Part, Comobluffian age, Tithonian Stage, Uppermost Malm Epoch, Late Jurassic.

Material: Anterior 2/3rds of skull with dentary in place.