Dinosaur brains dating
He gave this specimen a new name based on the conventions of his age and the relatively sparse fossil record available at that time.
In addition, they support cervical ribs that extend farther towards the ground than in diplodocines, and have vertebrae and ribs that are narrower towards the top of the neck, making the neck nearly triangular in cross-section.The first metatarsal is the stoutest, a feature shared among diplodocids. Marsh gave it this name based on the chevron bones, which are dissimilar to those of other dinosaurs; instead, the chevron bones of Apatosaurus showed similarities with those of mosasaurs.During excavation and transportation, the bones of the holotype skeleton were mixed with those of another Apatosaurus individual originally described as Atlantosaurus immanis; as a consequence, some elements cannot be ascribed to either specimen with confidence.meaning "deceptive lizard") is a genus of extinct sauropod dinosaurs that lived in North America during the Late Jurassic period. Apatosaurus had an average length of 21–22.8 m (69–75 ft), and an average mass of 16.4–22.4 t (16.1–22.0 long tons; 18.1–24.7 short tons).Othniel Charles Marsh described and named the first-known species, A. A few specimens indicate a maximum length of 11–30% greater than average and a mass of 32.7–72.6 t (32.2–71.5 long tons; 36.0–80.0 short tons).