About 250 million years ago, at the end of the Permian period, something killed some 90 ... The rocks that surrounded us date from the late Permian. For every yard of altitude we gained, we ...

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 ...

The period of time before the Triassic was called the Permian. This was a time when a wide variety of animals lived, including a group of animals called the synapsids, which would later evolve ...

The Permian-Triassic extinction event ... He says, 'The Triassic is an interesting period. It forms the transition between the late Palaeozoic Era, which was mainly populated by synapsids, or ...

These occurred at the end of the Ordivician, the Late Devonian ... The two biggest extinctions were at the end of the Permian Period, about 250 million years ago, and at the end of the Cretaceous ...

More than 17,000 species are known to have survived until the mega-extinction that ended the Permian period 251 million years ago. A predator of the Cambrian was the giant, shrimplike Anomalocaris ...

In the Permian period before ... Plesiosaurs appeared in the late Triassic period about 203 million years ago and ruled the oceans unchallenged for millions of years. One of these marine reptiles ...