This is a series,

this is CBS, I in the world.

I'm John Bachelor with Professor Carlos Jaramillo.

He is writing with his colleagues in Nature magazine,

revelations about the neotropical rainforests

before and after the strike of the asteroid comet at what is now the

yukatan and the shallow sea that ended the dinosaurs to our

understanding but also transformed what the dinosaurs fed on, the forest, the jungle.

Professor, if I read this correctly, your sampling from Columbia gives you a picture of the diversity over the next

six million years to about 60 million years and over the next 8 million years to

about 58. But what about the forests in Patagonia to the south? What about

the forests in Montana to the north? What about the forests in New Zealand? Do we know

what they look like in the recovery from the asteroid?

Well, from the beginning, I would expect that the tropics to suffer far more than temperate forests to the impact itself because the forests are not adapted

to winters while temperate forests they are.

And as you mentioned at the beginning, the first phases of the aftermath. It was a

long winter and I would expect from the beginning the tropics, the tropical plants could not cover very well with a winter because they never

experience a winter.

So you see a differential effect from the tropics to temperate regions on the extinction levels that this event caused.

So the extinction levels in Patagonia and New Zealand are not as high as in the tropics.

And if you see the overall... are not as high as in the tropics.

And if you see the overall composition of the forest,

...