Within what would have been a marine basin, it appeared that K. susanae may have taken refuge from the Ordovician-Silurian ...

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

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.

Extinction is a natural part of life on Earth. But occasionally, extinction rates have surged far beyond usual levels, driving mass extinction events that have reshaped the trajectory of life. After a ...