Late Cretaceous


Dinosaur Park Formation

There is a transition in the assemblage with Daspletosaurus coexisting with Gorgosaurus then replacing it as the top predator. Lambeosaurines and centrosaurines are the most common herbivores. Hypacrosaurus replaces the related Corthyosaurus from the lower and middle of the formation. Styracosaurus has a skeleton very similar to Centrosaurus from the lower part of the formation and may have been the same genus. Vagaceratops was initally though to be a form of the earlier Chasmosaurus. Euplocephalus contines to be present.