Our planet’s first known mass extinction happened about 440 million years ago. Species diversity on Earth had been increasing ...

For decades, the prevailing theory behind the mass extinction that ended the reign of the dinosaurs has pointed to a ...

Indeed, the earliest mammal we are currently aware of is the Brasilodon quadrangularis – a diminutive critter described as ...

A new study reveals that Earth's biomes changed dramatically in the wake of mass volcanic eruptions 252 million years ago.

Behind the dinosaurs was a case with skulls of Permian synapsids. They don't get many visitors. Lystrosaurus, the synapsid that inherited the barren world of the Triassic, stared out empty-eyed.

It forms the transition between the late Palaeozoic Era, which was mainly populated by synapsids, or mammal-like reptiles, and the Mesozoic Era, when the archosaurian reptiles, which includes the ...

This also marked the first time the earliest dinosaurs appeared. The Permian period’s mass extinction had wiped out the mammals that could have been competitors for these reptiles on land and in ...

More mammals were living on the ground several million years before the mass extinction event that wiped out the dinosaurs, new research has revealed.

Scientists don't call it the "Great Dying" for nothing. About 252 million years ago, upward of 80% of all marine species ...

One member of this group was a large, sail-backed animal called dimetrodon, which looks like it could be a dinosaur but isn’t. Then 252 million years ago came the Permian-Triassic extinction event.