Though the Cretaceous asteroid cleared the stage, mammals did not really get going until 10m years later, in the Eocene epoch.

尽管白垩纪时期小行星灭绝了居统治地位恐龙，但哺乳动物却一直到1000万年后才真正兴起繁盛起来。

Eocene, so, by about 40 million years ago, many of them had gone extinct.

，因此，到大约 4000 万年前， 其中许多已经灭绝。

By the late Eocene, practically all of the primates on those continents died out.

到晚期， 这些大陆上几乎所有灵长类动物都灭绝了。

Floristic Region, but their family was clearly much more widespread during the Eocene Epoch.

植物区地区发现，但它们然 要远得多 在时期广泛存在。

Other residents of Eocene Antarctica probably came from South America as well.

南极洲其他居民可能 也来自南美洲。

In the United States, Boverisuchus shows up fully-formed and ready to run in the early Eocene.

在美国，早期，Boverisuchus 已经完全成形并准备好奔跑。

Around 34 million years ago, the Eocene-Oligocene Transition  marked the first major period of global cooling and glaciation.

大约 3400 万年前，-渐过渡标志着全球变冷和冰川作用第一个主要时期。

Over the course of the Eocene epoch, the climate slowly began to cool.

在时期，气候 开慢慢变冷。

Clearly, Antarctica’s biodiversity took a hit after the Eocene.

然，南极洲生物多样性 在之后受到了打击。

The Paleocene-Eocene Thermal Maximum, 55 million years ago, was so warm, crocodiles swam the waters of the Arctic Circle.

5500 万年前古-极热期非常温暖，以至于鳄鱼在北极圈水域中游来游去。

What we do know is that the late Eocene and early Oligocene was a time of global cooling.

我们所知道是，晚期和 渐早期是全球降温时期。

As a result, our world is warming faster than it did back in the Eocene.

结果，我们界变暖速度 比早。

So given its size, it was able to support many different ecosystems in the Eocene.

所以考虑到它大小，它能够支持 许多不同生态系统。

But what happened to these Eocene animals?

但是这些动物发生了什么？

So by the time the Eocene Epoch was over, North America no longer had the right habitat for primates.

因此， 当结束时，北美不再有适合灵长类动物栖息地。

This period  of warming, known as the Paleocene-Eocene Thermal Maximum or PETM, was likely caused by  a combination of natural factors.

这一变暖时期被称为古-极热事件或PETM，可能是由多种自然因素造成。

And they arrived in South America by the middle Eocene Epoch, around 42 million years ago.

他们在大约 4200 万年前中期到达南美洲。

And a big environmental change was also underway in the last half of the Eocene, thanks to the chemistry of mountain-building.

由于造山化学作用，后半期也发生了巨大环境变化。

You see the Amazon formed during the Eocene epoch, up to 56 million years ago when the whole world was a lot warmer and wetter.

你可以看到亚马逊河形成于时期，距今约5600万年前，当时地球要温暖得多，湿润得多。

Or there's the Eocene, more than 34 million years ago, a hothouse time during which the continents drifted into their present configuration.

或者是超过 3400 万年前，这是一个温室时代，在此期间大陆逐渐变成了现在形态。