Diabloceratops [dee-ab-lo-ser-a-tops] is an extinct genus of centrosaurine ceratopsian dinosaur that lived approximately 79 million years ago during the latter part of the Cretaceous Period in what is now Utah, in the United States
The Puntledge River elasmosaur. This Cretaceous elasmosaur was the first found west of the Rockies .
Chasmosaurus | Flickr - Photo Sharing! :Chasmosaurus The first recognized skeleton of Chasmosaurus was named by Lawrence Lambe in 1914. The large skin-covered openings, or chasms, in the frill of this dinosaur would have made the frill too fragile to use in defence. Chasmosaurus is the only chasmosaurine with small, backwardly curving orbital horns. This dinosaur is from the Late Cretaceous, 75 to 74.5 million years ago in the Dinosaur Provincial Park, Alberta: