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'Black Beauty' a Tyrannosaurus rex fossil. Minerals stained the bones black during fossilization. Royal Tyrrell Museum

'Black Beauty' a Tyrannosaurus rex fossil. Minerals stained the bones black during fossilization. Royal Tyrrell Museum

Tyrannosaurus is a genus of coelurosaurian theropod dinosaur. Tyrannosaurus rex lived throughout what is now western North America, at the time an island continent termed Laramidia, with 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, 67 to 65.5 million years ago. It was among the last non-avian dinosaurs to exist before the Cretaceous–Paleogene extinction event.

Tyrannosaurus is a genus of coelurosaurian theropod dinosaur. Tyrannosaurus rex lived throughout what is now western North America, at the time an island continent termed Laramidia, with 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, 67 to 65.5 million years ago. It was among the last non-avian dinosaurs to exist before the Cretaceous–Paleogene extinction event.

Mounted composite cast of Pteranodon longiceps at the American Museum of Natural History, New York.

Mounted composite cast of Pteranodon longiceps at the American Museum of Natural History, New York.