The Late Cretaceous is a period in the Earth's history when the rise of the tyrannosaurs took place . What followed this period was a mass extinction that wiped out half of all life on Earth. The Late Cretaceous lasted 34.1 million years from 99.6-65.5 million years ago.
- "Dinosaurs Rule the World: Late Cretaceous Period." In: Dodson, Peter & Britt, Brooks & Carpenter, Kenneth & Forster, Catherine A. & Gillette, David D. & Norell, Mark A. & Olshevsky, George & Parrish, J. Michael & Weishampel, David B. The Age of Dinosaurs. Publications International, LTD. Pp. 103-104. ISBN 0-7853-0443-6.
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