The "Big Five" mass extinctions of the Phanerozoic Eon have long attracted significant attention from the geoscience ...

The "Big Five" mass extinctions of the Phanerozoic Eon have long attracted significant attention from the geoscience ...

The Ordovician period, from 485 to 444 million years ago, was a time of dramatic changes for life on Earth. Over a 30-million-year stretch, species diversity blossomed, but as the period ended ...

However, sometime around 445 million years ago, 85 percent of species went extinct over the relatively short interval of 1.4 million years. This unprecedented die-off is now known as the earth’s first ...

the end-Ordovician, according to Benton. That shift, which took place about 444 million years ago, led to the disappearance of 80% of species at a time when life was mostly limited to the seas.

A cataclysmic shift at the end of the Ordovician led to the disappearance of about 85% of species at a time when life was mostly limited to the seas. “Their link to those mass extinctions ...

Sharks have been around for hundreds of millions of years, appearing in the fossil record before trees even existed. But what did they evolve from, are they ‘living fossils’, and how did they survive ...

One of Earth's most consequential bursts of biodiversity—a 30-million-year period of explosive evolutionary changes spawning innumerable new species—may have the most modest of creatures to ...

Researchers have conducted hundreds of studies projecting how different species might respond to different levels of climate change, finding varied results. In an analysis published Thursday in ...

In Australia, unique species abound – from koalas and kangaroos to wombats and emus. Now, the western laughing frog and a spider named for Tom Hardy are among the 750 new species recognized on ...