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.

3 min read During the Ordovician period, 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 ...

This reptilian skin fossil belongs to a creature from the early Paleozoic era that led terrestrial ... of animals and their shift from water to land-based lives. The specimen was unearthed at ...