.96" Serrated, Theropod Dinosaur (Marshosaurus?) Tooth - Colorado

This is a .96" long theropod dinosaur tooth collected this past summer from the Morrison Formation. It comes from our partners private quarry East of Dinosaur, Colorado. It appears to be a megalosaurid (likely Marshosaurus) tooth, not the more common Allosaurus teeth, though the poor preservation on one edge makes it hard to say definitively.

It was left still attached to the sandstone it was found in during preparation. Serrations can be seen along one edge, but are missing on the other. There are several repaired fractures with some gap fill restoration in the cracks.

There are two main characteristics that distinguish Megalosaurid teeth 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.

Marshosaurus is a genus of medium-sized Megalosaur from the Late Jurassic, Morrison Formation. n 2010, Gregory S. Paul estimated its length at 4.5 meters (15 ft) and its weight at 200 kilograms (440 lb). It's one of the rarer theropods in the Morrison Formation with only a single partial specimen having been recovered.

An artists reconstruction of Marshosaurus.  By Danny Cicchett. Creative Commons License
An artists reconstruction of Marshosaurus. By Danny Cicchett. Creative Commons License

DETAILS
SPECIES
Marshosaurus?
LOCATION
Dinosaurs Of America Quarry, Dinosaur, Colorado
FORMATION
Brushy Basin Member, Morrison Formation
SIZE
.96" long (straightline)
CATEGORY
SUB CATEGORY
ITEM
#177373
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