Does carbon dating work dinosaurs
Dinosaurs have always been an extremely varied group of animals; according to a 2006 study, over 500 non-avian dinosaur genera have been identified with certainty so far, and the total number of genera preserved in the fossil record has been estimated at around 1850, nearly 75% of which remain to be discovered.
Dinosaurs today inhabit every continent, and fossils show that they had achieved global distribution by at least the early Jurassic period.Birds are thus considered to be dinosaurs and dinosaurs are, therefore, not extinct. Barrett in 2017 suggested a radical revision of dinosaurian systematics. recovered the Ornithischia as being closer to the Theropoda than the Sauropodomorpha, as opposed to the traditional union of theropods with sauropodomorphs.Birds are classified as belonging to the subgroup Maniraptora, which are coelurosaurs, which are theropods, which are saurischians, which are dinosaurs. They resurrected the clade Ornithoscelida to refer to the group containing Ornithischia and Theropoda.While dinosaurs were ancestrally bipedal, many extinct groups included quadrupedal species, and some were able to shift between these stances.Elaborate display structures such as horns or crests are common to all dinosaur groups, and some extinct groups developed skeletal modifications such as bony armor and spines.
Many dinosaurs were quite small: Xixianykus, for example, was only about 50 cm (20 in) long.