The Triassic Period was a time of great change. Bookended by extinctions, this era saw huge shifts in ... extinction event devastated life. The Permian-Triassic extinction event, also known as the ...

For months I'd been on the trail of the greatest natural disaster in Earth's history. About 250 million years ago, at the end of the Permian period, something killed some 90 percent of the planet ...

Learn more about a time period marked by an intense burst of evolution. 3 min read The Cambrian period, part of the Paleozoic era, produced ... were wiped out in the Permian extinctions about ...