0.5" Tyrannosaur Fossil Premax Tooth Cretaceous Dinosaur Judith River FM MT COA

Location: Judith River Formation, Hill County, Montana (Private Land Origin)

Weight: 0.3 Ounces 

Dimensions: 0.5 Inches Long, 0.2 Inches Wide, 0.2 Inches Thick

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Probably an excellent Gorgosaurus or Albertosaurus tooth, based on the size and base height of the tooth cross-section

Albertosaurus, Gorgosaurus, and Daspletosaurus

During the Late Cretaceous period, northern North America was home to several notable Tyrannosaurs, including Albertosaurus, Daspletosaurus, and Gorgosaurus. Fossils of these apex predators have been found in the Judith River Formation in Montana and various formations in Alberta, Canada. The Judith River Formation, approximately 70 million years old, predates the Hell Creek Formation—famous for Tyrannosaurus rex—by about five million years. These tyrannosaurs are early relatives of T. rex and, while formidable, were all smaller than their later giant cousin.

Daspletosaurus and Gorgosaurus were similar in size, coexisting in the same ecosystems at around 30 feet in length and weighing up to 5,000 pounds. Albertosaurus reached comparable lengths of up to 30 feet but had a lighter frame, with a maximum weight of 4,000 pounds, and evolved slightly later than its Judith River Formation relatives.

The teeth of Albertosaurus, Daspletosaurus, and Gorgosaurus are similar in size and morphology, making the identification of isolated specimens challenging. Daspletosaurus, slightly larger and belonging to the same subfamily as Tyrannosaurus rex, likely had dental features more closely resembling T. rex. In contrast, Albertosaurus teeth are smaller and more slender, adapted for slicing prey.

These exquisitely preserved Late Cretaceous tyrannosaur teeth from northern North America provide valuable insight into the evolution of Tyrannosaurus rex and its early relatives, showcasing the diversity and dominance of apex predators in Cretaceous ecosystems.