Judith River/White River Fossils
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Dinosaurs from Judith River formation

Ceratopsians were stocky, herbivorous, four legged, horned dinosaurs. The best known representative of this group is Triceratops.  Ceratopsians had a bony frill extending from the back of their skull and typically had one or more horns on their skull.  Unlike Hadrosaurs, they had just a single row of teeth exposed at a time, although these were replaced frequently.  They had a horny beak at the front of the jaw.

Ceratopsians comprise the suborder Ceratopsia within the ornithischian (bird-hipped) dinosaurs.

Centrosaurus

Centrosaurus was a  short frilled ceratopsian with a bumpy frill and two hooking horns at the top of the frill.  It had small hooves with thick legs, much like a modern rhinoceros.  It's believed to have fed on root food and other plant material while roaming in large herds.

Triceratops horridus

Triceratops is the largest of the short-frilled ceratopsians.  The skull and frill are together more than 6 feet long, while the two main horns are more than 3 feet long.   Triceratops is well known from many specimens.  Triceratops skulls are more commonly preserved than most other dinosaurs that had relatively flimsy skulls.    It was a herbivore, browsing in large herds, surviving right up to the extinction of the dinosaurs.  Triceratops was the only Ceratopsian surviving into the Maastrichten.

Pachyrhinosaurus

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