Pirate Gold Coins :Treasures of the Jurassic "Allosaurus Tooth" This beautiful tooth is of exceptional size and quality. It is the maxillary tooth from the upper jaw of an adult Allosaurus, and measures 4.7” in length. The serrations are excellent and it was found complete in the Jurassic-age Morrison formation of Wyoming. This rare tooth would highlight an advanced dinosaur fossil collection. All-natural, with very minimal stabilization.