The Jurassic Period is one of the three prehistoric geological periods of the Mesozoic Era. It spans from 145 million to 201 million years ago. This period was preceded by the Triassic Period and ...

Our planet’s first known mass extinction happened about 440 million years ago. Species diversity on Earth had been increasing over a period of roughly 30 million years, but that would come to a halt ...

Boulder, Colo., USA: Mass extinctions are extremely catastrophic events on Earth. Throughout Earth’s evolutionary history, numerous mass extinctions have occurred, with five major mass extinctions ...

The Triassic is a geologic period of the Mesozoic Era spanning approximately 252 to 201 million years ago, immediately following the Permian–Triassic mass extinction and preceding the Jurassic. It is ...

Prehistoric trees like Ginkgo and monkey-puzzles still have close relatives that go back at least to the time of the dinosaurs.