Pinpointing when early land plants colonized terrestrial environments and began influencing Earth's systems is a core ...

Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...

How long did the Ordovician period last, and what caused the Ordovician mass extinction to wipe out 85 percent of life on earth 445 million years ago? Long before the dawn of humans, dinosaurs, ...

Fossils from 465 million years ago recently discovered in Portugal have revealed the huge size reached by trilobites, the most diverse group of extinct marine arthropods. Geologists describe the ...

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 vast ...

The Earth has gone through many major events over the course of hundreds of millions of years. Some of the most significant are the six mass extinction events that have occurred. These are times when ...

Over half a billion years ago, during the Cambrian geological period, life on Earth started to get a lot more interesting. Thanks to the rise in free oxygen generated mostly by photosynthesizing algae ...