Like other tyrannosaurids, Tyrannosaurus was a bipedal carnivore with a massive skull balanced by a long, heavy tail. It was the last known member of the tyrannosaurids and among the last non- avian dinosaurs to exist before the Cretaceous–Paleogene extinction event. Fossils are found in a variety of rock formations dating to the Maastrichtian age of the Upper Cretaceous period, 68 to 66 million years ago. Tyrannosaurus had a much wider range than other tyrannosaurids. It lived throughout what is now western North America, on what was then an island continent known as Laramidia. rex or colloquially T-Rex, is one of the best represented theropods. The species Tyrannosaurus rex ( rex meaning "king" in Latin), often called T. 'tyrant lizard' from Ancient Greek τύραννος ( túrannos) 'tyrant', and σαῦρος ( saûros) 'lizard') is a genus of large theropod dinosaur. Tyrannosaurus ( / t ɪ ˌ r æ n ə ˈ s ɔː r ə s, t aɪ-/ lit. (Gilmore, 1946) Bakker, Williams & Currie, 1988 (Gilmore, 1946) Charig in Appleby, Charig, Cox, Kermack & Tarlo, 1967
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