Species: gracilis BROWN, 1914
Etymology:
Referred material:
STERNBERG, 1951
Locality: 14 miles north of the locality of the type, directly over Campkin's coal mine, in the Northeast corner of Sec. 12, T36, R22, W of 4 mer., about 1/3 1/2 miles northeast of Elnora, Alberta Province, Canada.
Horizon: Scollard Formation, Uppermost Edmonton Group.
Biostratigraphy:
Age: Lancian Age, uppermost Maastrichtian Stage, uppermost Senonian subepoch, Upper Upper Gulf Epoch, Late Cretaceous.
Material:
Plesiotypes
NMC 8887: Complete articulated skeleton.
NMC 8888: Consist of skeleton, complete except most of skull and jaws and part of front foot.
Note: A skeleton has been found with a furcula.