A new study suggests that extreme temperatures could lead to a mass extinction event, ending the reign of humans and mammals ...

But first there was a period of biological regrouping following the disastrous climax to the Ordovician ... The Silurian drew to a close with a series of extinction events linked to climate ...

This can be seen also in the geological record. Five big mass extinction events are recognized by paleontologists. At the end of the Ordovician some 443 million years ago, when an estimated 86% of ...

The Late Ordovician Extinction Event (LOME), the first of the “Big Five” extinction ... occurs at the base of the Silurian, demonstrating its global scale. Geochemical and lithological data tie this ...