Rare, .91" Serrated, Megalosaurid (Marshosaurus) Tooth - Colorado

This is a rare, .91" long Megalosaurid (Marshosaurus bicentesimus) tooth collected from the Morrison Formation. It comes from our partner's private quarry East of Dinosaur, Colorado. The tooth exhibits nice enamel and fine serrations. It has been completely removed from the sandstone it was found in. This specimen has a repaired crack near the tip.

Comes with an acrylic display case.

There are two main characteristics that distinguish it from the much more frequently found Allosaurus teeth. First, the serrations on the mesial edge of the tooth extend less than half way down the length of the tooth. Secondly, there is little to no spiraling of the serrations as seen on Allosaurus teeth. Additionally, it's also fairly thin in cross-section and has a hooked profile.

There are three described Megalosaurs in the Morrison Formation; Marshosaurus, Stokesosaurus, and Torvosaurus. The tooth is too small to be Torvosaurus and Marshosaurus is the more common of the remaining two, which leads us to believe they are most likely Marshosaurus.

Marshosaurus is a genus of medium-sized Megalosaur from the Late Jurassic, Morrison Formation. In 2010, Gregory S. Paul estimated its length at 4.5 meters (15 feet) and its weight at 200 kilograms (440 pounds). It is one of the rarer theropods in the Morrison Formation: only a single partial specimen has ever been recovered.

An artist's reconstruction of Marshosaurus,  by Danny Cicchett. Creative Commons License
An artist's reconstruction of Marshosaurus, by Danny Cicchett. Creative Commons License
Marshosaurus bicentesimus
Dinosaurs Of America Quarry, Dinosaur, Colorado
Brushy Basin Member, Morrison Formation
.91" long (straightline)
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