Rare, 1.52" Megalosaurid (Marshosaurus) Tooth - Colorado

This is a rare, 1.52" long Megalosaurid (Marshosaurus bicentesimus) tooth collected from the Morrison Formation. It comes from our partner's private quarry East of Dinosaur, Colorado. It has nice enamel and spots of preserved serration. It has been completely removed from the sandstone and there is a repaired crack through the middle of the tooth.


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

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.