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.65" Serrated, Megalosaurid (Marshosaurus) Tooth in Situ - Colorado
This is a rare, .65" long Megalosaurid (Marshosaurus bicentesimus) tooth collected from the Morrison Formation. It comes from our partners' private quarry East of Dinosaur, Colorado. It has nice enamel and fine serrations.
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.
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
SPECIES
Marshosaurus bicentesimus
LOCATION
Dinosaurs Of America Quarry, Dinosaur, Colorado
FORMATION
Brushy Basin Member, Morrison Formation
SIZE
Tooth: .65" long (straightline), Rock: 2.4 x 1.1"
CATEGORY
SUB CATEGORY
ITEM
#222501
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