The largest extinction events define a change in era. The end of the Paleozoic and beginning of the Mesozoic 251 million years ago marks the largest mass extinction in the history of the planet, which ...

part of the Paleozoic era, a rich variety of marine life flourished in the vast seas and the first primitive plants began to appear on land—before the second largest mass extinction of all time ...

The Devonian, part of the Paleozoic era, is otherwise known as ... on land apparently escaped the worst effects of the mass extinction that ended the Devonian. The main victims were marine ...

Last summer, a pair of hikers were trekking through a rocky path in the Italian Alps. As they made their way down the ...

In the late Paleozoic and early Mesozoic eras, which were around 335 to 175 million years ago, a supercontinent known as ...