The bear case rests on patience, a Persian restoration and a Permian boom.

看跌的理由在于耐心，波斯的恢复和二叠纪的繁荣。

The idea that an impact caused the Permian extinction has been around for a while.

导致二叠纪大灭绝的原因长期以来都没有一个定论。

But as the Permian went on, the climate got hotter and drier.

但随着二叠纪的进行，气候变得越来越 热和干燥。

The acquisition expands Chevron's shale-oil assets in America's Permian basin, where Anadarko is a leading independent operator.

此次收购扩大了雪佛龙在美国二叠纪盆地的页岩油资产，阿纳达是该地区领先的独立运营商。

Presto! The Permian mass extinction is explained.

就这样！这就是二叠纪种大灭绝的解。

The event took place at the end of what Earth scientists, or geologists, call the Permian Period.

这一事件发生在地球家或地质家所说的二叠纪末期。

And as it turned out, the Permian too was absolutely covered with previously inaccessible petroleum-rich shale rocks beneath the surface.

而事实证明，二叠纪盆地的地表下也绝对覆盖着以前无法触及的富含石油的页岩。

And then all eyes began once again turning back towards the gigantic Permian Basin over in west Texas.

然后，所有的目光又开始转向德克萨斯州西部巨大的二叠纪盆地。

We think something similar was the cause of the end-Permian extinction.

们认为类似的事情是二叠纪末灭绝的原因。

As the Permian progressed, amniote predators like Dimetrodon, Ophiacodon, and eventually saber-toothed gorgonopsians became widespread.

随着二叠纪的进展，羊膜动捕食者如异齿龙、蛇夫和最终的剑齿蛇目动变得普遍。

The cause of the End-Triassic extinction is even murkier than the End-Permian extinction.

三叠纪末灭绝的原因甚至比二叠纪末灭绝的原因还要模糊。

First was the Permian-Triassic extinction 252 million years ago -- aka the Great Dying.

首先是 2.52 亿年前的二叠纪-三叠纪大灭绝 ——也就是大灭绝。

With unique teeth, extra speed, and a complex social life, Dimetrodon was able to dominate Early Permian environments.

凭借独特的牙齿、超快的速度和复杂的社会生活，异齿龙能够主宰二叠纪早期的环境。

Another major player in Permian waters was Prionosuchus, a genus from Brazil.

二叠纪水域的另一个主要参与者是来自巴西的Prionosuchus。

This includes what's probably the Permian's most famous amphibian: Eryops, found in Texas and the southwestern United States.

这包括可能是二叠纪最著名的两栖动：Eryops，发现于德克萨斯州和美国西南部。

Marathon owns assets in Eagle Ford in Texas, Bakken in North Dakota, Permian in New Mexico and Texas, and in Oklahoma.

马拉松石油公司在德克萨斯州的鹰滩、北达他州的巴肯、新墨西哥州和德克萨斯州的二叠纪盆地以及俄克拉荷马州拥有资产。

But in the Early Permian, humid tropical swamps still straddled the equator.

但在二叠纪早期，潮湿的热带沼泽仍然横跨赤道。

Estimates for the number of animal species alive at the end of the Permian range from as low as 45,000 to as high as 240,000.

据估计，二叠纪结束的时候，活着的动种数量从45000-240000种不等。

But the real whopper was the Permian extinction of about 245 million years ago, which raised the curtain on the long age of the dinosaurs.

但是，真正厉害的是大约24500万年前的二叠纪灭绝，它为漫长的恐龙时代揭开了序幕。

But evidence is accumulating that the biggest extinction of all, 252.3m years back, at the end of the Permian period, was indeed also triggered by an impact.

不过有证据不断地证明发生在2亿5230万年前二叠纪时期的那次大灭绝也是因为陨石坠落而造成的。