Learn more about the time period that took place 488 to 443 million years ago. 3 min read During the Ordovician period, part of the Paleozoic era, a rich variety of marine life flourished in the ...
Detail images of fossils from the Ordovician Period outcrop on Anticosti Island, Quebec, Canada. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to ...
Let’s start with a clear definition of what constitutes a mass extinction. Unlike regular extinctions, which occur at a steady background rate — about 10% of species lost every million years — mass ...