Everyone knows that dinosaurs are extinct, and most people have some idea about how it might have occurred. But the exact ...

The largest extinction events define a change in era. The end of the Paleozoic and beginning of the Mesozoic 251 million years ago marks the largest mass extinction in the history of the planet, which ...

The productive Paleozoic era gave rise to hard-shelled organisms, vertebrates, amphibians, and reptiles. Dinosaurs ruled the Earth in the mighty Mesozoic. And 64 million years after dinosaurs went ...

The oldest is the Paleozoic Era, which means ‘ancient life’ and occurred between 541 and 252 million years ago. Next is the Mesozoic Era, which means ‘middle life’ and spans 252 to 66 ...