rex, though these dinosaurs only lived at the end of the period, around 68-66 million years ago. 'The Cretaceous is 80 million years long, so there's a lot of turnover in that time,' says Susie. In ...
Learn about the time period that took place 251 to 199 million ... including rodent-size mammals and the first dinosaurs. By the start of the Triassic, all the Earth's landmasses had coalesced ...
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