1.5" Tyrannosaur Fossil Toe Bone Cretaceous Dinosaur Judith River FM Montana COA

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

Weight: 0.5 Ounces 

Dimensions: 1.5 Inches Long, 0.5 Inches Wide, 0.2 Inches Thick

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Albertosaurus, Gorgosaurus, and Daspletosaurus

The Judith River Formation is approximately 70 million years old, or about 5 million years older than the Hell Creek Formation, which produces Tyrannosaurus Rex.

Tyrannosaurs from the Late Cretaceous period in northern North America notably include Albertosaurus, Daspletosaurus, and Gorgosaurus. Their fossils have been recovered from Montana’s Judith River Formation and corresponding formations in Alberta. These genera are closely related and represent early evolutionary branches of Tyrannosaurus rex, which appeared near the end of the Cretaceous. Each of these tyrannosaurs was smaller than T. rex. Daspletosaurus and Gorgosaurus were of comparable size, coexisting at roughly 30 feet in length and weighing up to 5,000 pounds. Albertosaurus was similar in length but lighter, with a maximum weight of around 4,000 pounds, and appears to have evolved slightly later than the other Judith River tyrannosaurs.

Albertosaurus, Daspletosaurus, and Gorgosaurus teeth of similar sizes and designs make the identification of isolated teeth nearly impossible. Daspletosaurus would be slightly larger than the other two Tyrannosaurs, and it was in the same subfamily as Tyrannosaurus rex. So, Daspletosaurus is more closely related to Tyrannosaurus rex and may have had tooth characteristics more like Tyrannosaurus rex. Albertosaurus teeth are typically smaller and thinner since they would be used for slicing prey. These tyrannosaur teeth from the Late Cretaceous of northern North America are high-quality and exceptional teeth and are fantastic examples of an early relative of Tyrannosaurus rex.