More than 17,000 species are known to have survived until the mega-extinction that ended the Permian period 251 million years ago. A predator of the Cambrian was the giant, shrimplike Anomalocaris ...

Scientists later confirmed these were fossilized tracks of five prehistoric species from the Permian Period. The fossils tell the tale of a world on the brink. During the Permian Period ...

Roughly the same as the total GHG emission from all sources for the state of Hawaii during the same period ... in the Permian — an area roughly the size of Great Britain that is responsible ...