Holotype: Not given.

Locality: Utah.

Horizon: Tropic shale.

Biostratigraphy:

Age: Cenomanian Stage, Upper Gallic Subepoch, Lowermost Gulf Epoch, Middle Cretaceous.

Material:

Nearly complete adult “pliosaur”.

A skull and serverial vertebrae of another adult “Pliosaur”.

Several vertebrae of a juvenile.

Several bones of a paddle.