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This is CBS I On The World.

I'm John Bachelors and I'm traveling backwards in time with Thomas Halliday,

the author of Other Lands, a journey through Earth's extinct worlds,

a new book that allows you to go back and back and back and always asking

yourselves, how did we get here from there?

We go now to the Permian 253 million years ago,

253 million years ago, which is right before an extinction event.

So what is around us now is about to go through a crisis.

However, what I've written down is that it was both a dusty world

and a wet world with megaman soons.

Where do we look, Thomas, for the best fossil record at this point,

253 million years ago?

...