Genus: Gorgosaurus LAMBE, 1914
Etymology: Greek, gorgos “swift, fierce” and Greek, sauros “lizard”, fierce lizard.

Species: libratus LAMBE, 1914
Etymology:


Holotype: CMN 2120

Locality: 3 1/2 miles below the mouth of Berry Creek, on the south side of the Red Deer River, near prairie level, Dinosaur Provincial Park, Alberta Province, Canada.

Horizon: Dinosaur Park Formation, upper Judith River Group.

Biostratigraphy:

Age: Judithian age, Middle Campanian Stage, middle Senonian subepoch, upper Gulf Epoch, Late Cretaceous.

Material: Almost complete skull and lower jaws, skeleton lacking cervicals and some dorsal vertebrae.
Note: A furcula was found but BYRANT & RUSSELL Disagree.

Referred material:

MAKOVICKY & CURRIE, 1998

Locality: Dinosaur Provincial Park, Alberta Province, Canada.

Horizon: Dinosaur Park Formation, upper Judith River Group.

Biostratigraphy:

Material:

RTMP 91.36.500: Fragmentary skeletons with furculae.
(TANKE & CURRIE, (1998) 2000)

RTMP 94.12.602: Fragmentary skeletons with furculae.