Genus: Pachycephalosaurus BROWN & SCHLAIKJER, 1943 (nomen conservandum)

Species: wyomingensis (GILMORE, 1931) BROWN & SCHLAIKJER, 1943

Referred material:

PETERSON & VITTORE, 2012

Locality: Exact coordinates of the collection site are on file at the Burpe Museum of Natural History (BMR), Carter County, Montana.

Horizon: Hell Creek Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

BMR P2001.4.5: Isolated frontoparietal dome with two large oval depressions on the dorsal surface, accompanied by numerous circular pits on teh margin and inner surface of the larger depressions possible due to head butting.