This is not the stuff of fantasy, but a reality of Earth during the Carboniferous period, over 300 million years ago. During this time, our planet was a vastly different place, with oxygen-rich ...

This time period took place 359 to 299 million years ago. 3 min read The Carboniferous period, part of the late Paleozoic era, takes its name from large underground coal deposits that date to it.