During this period, oceans formed as land shifted and broke out of one big supercontinent into smaller ones. 3 min read Continents were on the move in the Cretaceous, busy remodeling the shape and ...

They first appeared around 240 million to 230 million years ago in the Triassic Period, and went extinct around 66 million years ago, at the end of the Cretaceous Period, when a massive asteroid ...

Sixty-six million years ago, at the end of the Cretaceous Period, an asteroid impact near the Yucatán Peninsula of Mexico triggered the extinction of all known non-bird dinosaurs. But for the ...

This speed made it an exceptional predator during Early Cretaceous North America. Deinonychus is often credited with changing the perception of dinosaurs from slow-moving, reptilian giants to ...