.5" Fossil Ceratopsian Dinosaur Tooth - Judith River Formation

This is a beautiful fossil Ceratopsian dinosaur tooth, collected from the Late Cretaceous age Judith River Formation in Montana. The tooth is .5" wide and shows a flat "polished" surface indicative of feeding wear. Ceratopsian shed their teeth throughout their lives and had dental batteries containing hundreds of teeth that were constantly growing. It comes in an acrylic display case.

Within the Judith River Group there are multiple Ceratopsid genera and species, so with just a single bone or tooth they are hard to differentiate and give a definitive identification. However, based on the features of this tooth that are present, it's likely that the genus is either Chasmosaurus or Centrosaurus.

Ceratopsians are a group of plant-eating dinosaurs from the Cretaceous characterized by a bony frill on the back of the skull and a unique upper beak bone, called a rostral. Ceratopsians ranged in size from 1 meter (3 ft) and 23 kilograms (50 lb) to over 9 meters (30 ft) and 9,100 kg (20,100 lb). Triceratops is by far the best-known ceratopsian to the general public.

The Judith River Formation is one of the most prolific sources of Late Cretaceous vertebrate fossils. At least sixteen Orders containing more than forty Genera are known from the formation. These include fish, amphibians, mammals, and insects in addition to the reptiles, avian and non-avian dinosaurs (birds). Among the more interesting specimens is Leonardo, a mummified and fossilized Brachylophosaurus. This is a Hadrosaur, a duck-billed dinosaur with amazing preservation of the soft tissues of the body. The pattern in the skin of the feet is even preserved. In addition to Leonardo, the Judith River Formation contains the remains of the theropod Hesperornis, the only known freshwater Hespernorthid, a penguin like bird.
Chasmosaurus or Centrosaurus
Hill County, Montana
Judith River Formation
.5" wide
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