The Cretaceous is split into two smaller time periods called epochs. The Early Cretaceous Epoch lasted from 145 million years ago to 100.5 million years ago and the Late Cretaceous Epoch lasted from ...

Sixty-six million years ago, at the end of the Cretaceous Period, an asteroid impact near the Yucatán Peninsula of Mexico ...

at the end of the Cretaceous Period, an asteroid impact near the Yucat n Peninsula of Mexico triggered the extinction of all known non-bird dinosaurs. But for the early ancestors of today's ...