Tyrannosaurus[nb 1] is a genus of coelurosaurian theropod dinosaur. The species Tyrannosaurus rex (rex
meaning "king" in Latin) is one of the most well-represented of the large theropods. Tyrannosaurus lived
throughout what is now western North America, on what was then an island continent known as Laramidia.
Tyrannosaurus had a much wider range than other tyrannosaurids. 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.[2] It
was the last known member of the tyrannosaurids,[3] and among the last non-avian dinosaurs to exist before
the Cretaceous–Paleogene extinction.