2.35" Tyrannosaur (Daspletosaurus?) Tooth - Two Medicine Formation

This is a big, fat, 2.35" long, serrated Tyrannosaur tooth collected this summer from the Two Medicine Formation of Montana. It is hard to get teeth this nicely preserved from the formation, particularly large ones. The layer was deposited during a flood event, so the teeth are typically tumbled and worn with missing serrations or tips.

This tooth has nice enamel though most of the serrations are worn. There are a few crack repairs, but only some minor gap fill restoration. As explained below, there are three types of Tyrannosaurs in the formation and their teeth nearly identical, but based on the large size of this tooth it's most likely Daspletosaurus.


There are three described Tyrannosaurs from the Two Medicine Formation & Judith River Formation; Albertosaurus, Gorgosaurus and Daspletosaurus. Research done on teeth from these three Tyrannosaurs has concluded that isolated teeth are statistically impossible to assign to a specific genus because they are so similar.

Morphometry of the teeth of western North American tyrannosaurids and its applicability to quantitative classification

The Two Medicine Formation is a geographical formation in Central Montana and Southern Alberta, Canada. The formation is predominantly sandstone laid down by rivers and deltas during the Campanian Age of the Cretaceous about 80-75 million years ago. Approximately two thousand feet thick on the western edge, it lies on top of the Virgelle Sandstone formation and under the Bearpaw Shale. It is located between the Front Range of the Rocky Mountains and the Sweetgrass Arch, a tectonic fold feature 40-90 miles east of the Front Range.

The Two Medicine is the same age as the Judith River Formation found further east. It was laid down further inland from the Western Interior Seaway, while the Judith River Formation was deposited along the coast. The Two Medicine contains much of the same dinosaur fauna, but fewer reptiles, amphibians and aquatic fossils.

A view of the Two Medicine Formation quarry operated by Northwest Montana Fossils where much of our Two Medicine dinosaur material has been found.
A view of the Two Medicine Formation quarry operated by Northwest Montana Fossils where much of our Two Medicine dinosaur material has been found.


DETAILS
SPECIES
Daspletosaurus?
LOCATION
Pondera County, Montana
FORMATION
Two Medicine Formation
SIZE
2.35" long (straightline)
CATEGORY
SUB CATEGORY
ITEM
#183248
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