Species: ultimus BROWN, 1913
Etymology: Latin, ultimus, "last."

Holotype: AMNH 5261

Locality: Eastern (right) bank of Red Deer River at about the midpoint between the Tolman and Morring bridges, near Drumheller, Wheatland County, Alberta Province, Canada.

Horizon: Horseshoe Canyon Formation, Edmonton Group.
Biostratigraphy:

Biostratigraphy:

Age: Edmontonian age, lower Maastrichtian Stage, Upper Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material: 12 cervicals, 18 dorsals, 5 caudal vertebrae, 30 ribs, 7 abdominal ribs, coracoids, scapulae, humeri, ilia, ischia, pubes, femora, 3 epipodials, 7 meso-and metapodials and 15 phalanges.

Note: From freshwater

Referred material:

TANKE pers. Com.

Locality: Dinosaur Provincial Park, Newell County, 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:

RTMP: Fragmentary skeleton.

 

RUSSELL & CHAMNEY, 1967, SATO & WU, 2006, TANKE, 2007

Locality: 40 feet above Red Deer River, 7 miles below Tolman Ferry, left (western) bank of the Red Deer River, Sec. 14?, TWP 33, R22W, near Drumheller, Wheatland County, Alberta Province, Canada.

Horizon: Horseshoe Canyon Formation, Edmonton Group.

Biostratigraphy:

Age: Edmontonian age, lower Maastrichtian Stage, Upper Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

CMN 9454; Partial skeleton of a young individual consisting of 4 teeth, about 35 vertebrae (partialy restored), 45 ribs, one gastralium, coracoids, ilia, right (?) pubis, ischium, humeri, right femur, paddle elements and gastroliths.

Note: Found with the paratype Anchiceratops ornatus, AMNH 5259