The Paleozoic era's Silurian period saw animals and plants finally emerge on land. But first there was a period of biological regrouping following the disastrous climax to the Ordovician.

“like the imprint of some animals’ fingertips and belly skin.” The Permian period, the last part of the Paleozoic Era, ended with the largest mass extinction in the history of life on Eart ...

3 min read During the Ordovician period, part of the Paleozoic era, a rich variety of marine ... remained confined to the seas with new animals evolving in place of those that didn't survive ...

revealed a significant rise in marine oxygenation during the Late Paleozoic era (400 million years ago), hundreds of millions of years after the emergence of animal-life. These findings suggest ...