Jurassic Morrison Marshosaurus Tooth VF-JC-18-052Marshosaurus bicentesimus Morrison Formation Brushy Basin Member Upper Jurassic Moffat County, Colorado Here is a very fine example of the very rare Morrison carnivorous dinosaur Marshosaurus. The tooth is 3. 8 cm long. The tooth is slender in cross section and the serrations are smaller than other Morrison carnivorous dinosaurs. The serrations on the anterior keel of the tooth extend two thirds of the distance from tip to base. These features are