Euplocephalus was a ankylosaurid. It had a tail club it had short spine on the forequarters and the base of the tail. Two related but seperate ankylosaurids are Scolosaurus and Dyoplosaurus also found in the formation. Anklosaursid had broader mouths than nodosaurs and large triangular hornlets at he back cornors of heavily armored heads. Parasaurlophus was a lambeosaurid rare in the formation but more common in south.

Chasmosaurus had large holes to reduce its weight. It had 2 short horns above its eyes, and a single short nose horn. Males possibly had longer eye horns than females. Chasmosarines are less common at Dinosaur Park. Ankylosaurid fauna of North America was more diverse in the Dinosaur Park formation.

Gorgosaurus was an albertosaurine and lived in a lush floodplain environment along the edge of an inland sea. An apex predator, it was at the top of the food chain, preying upon abundant ceratopsids and hadrosaurs. It was a relatively gracile tyrannosaur that may have specialized in lambesaurids and centrosaurines. The albertosaurines, lambeosaurines and centrosaurines seemed to have shared a prefererences. Later when centrosaurines disappear and lambeosaurines become rare the albertosaurines also become rare. Gorgosaurus actively hunted fleet-footed hadrosaurs. centrosaurine and lambeosaurines dominate in northern latitudes this pattern indicates shared ecological preferences.

In some areas, Gorgosaurus coexisted with another tyrannosaurid, Daspletosaurus. Though these animals were roughly the same size, there is some evidence of niche differentiation between the two. Gorgosaurus is the best-represented tyrannosaurid. Juveniles may have suppressed smaller theropods like troodontids and dromesaurs.