Jurassic Start: Fossil Pushes Tyrannosaurs' Origin Back 10 Million Years
Wednesday, November 4, 2009 - 19:14
in Paleontology & Archaeology
Tyrannosaurus rex and its relatives were North America's dominant predators in the late Cretaceous period, about 99 million to 65 million years ago, but a new analysis of a toothy fossil skull suggests that the early history of this group includes smaller meat-eating ancestors that date as far back as 170 million years ago. [More]