Evidence that these lizard kings dominated the oceans in the Cretaceous period.

这种发现证明了这些蜥蜴王在白垩纪就统治了海洋。

But that didn't stop dinosaurs from nesting there during the Cretaceous period.

但这没阻挡恐龙在白垩纪时在此筑巢。

That happened 66m years ago, at the end of the Cretaceous period.

这一切就发生在6600万年前的白垩纪末期。

The Cretaceous period was much cooler than that of the Jurassic that preceded it.

白垩纪时期远比之前的侏罗纪时期更加寒冷。

During the Cretaceous period, 140 million years ago, this dinosaur sported a neck of dangerous looking spines.

在一亿四千万年前的白垩纪，这种恐龙的脖子上长着看起来很危险的刺。

In the case of pelagornithids, this particular role would be filled by flying reptiles in the Cretaceous period.

白垩纪时期，飞行爬行动物会取代 pelagornithids 这一特殊角色。

Over the next 90 million years, a new era called the Cretaceous period dawned.

在接下来的九千万年里，开始了一个叫做白垩纪的新时期。

But early in the Cretaceous period, both species would eventually lose the bigger fight, becoming extinct.

不过在早白垩纪时期，两个物种都逐渐在另一场更大的斗争中败下阵来，它们都灭绝了。

The best-documented such impact took place 65 million years ago at the end of the Cretaceous period of geological history.

记载最完整的这种灾难曾发生在6500万年前，在地质历史阶段的白垩纪末期。

By the end of the Cretaceous period, global environmental changes saw the emergence of tougher, more fibrous species of plants.

到了白垩纪末期，全球的环境变化带来了更坚韧、纤维更多的植物物种。

We know at the end of the Cretaceous period when these two dinosaurs go extinct, something big occurs in the environment.

我们知道在白垩纪的末期这两种恐龙灭绝之时，环境出现了巨大变化。

A species of dinosaur discovered in an Egyptian desert has shed new light on beasts that roamed Africa in the Cretaceous period.

在埃及沙漠中发现的一种恐龙，为白垩纪漫步于非洲的野兽提供了新的认识。

Actually, Joey, it's the Cretaceous period.

实际上，乔伊，现在是白垩纪时期。

The oldest material in these cores dated back 101.5m years, to the middle of the Cretaceous period, the heyday, on land, of the dinosaurs.

这些岩心中最古老的物质能够追溯到1.015亿年前的白垩纪中期，也就是恐龙在陆地上的全盛时期。

So in the case of pelagornithids, this particular role would be filled by flying reptiles in the Cretaceous period.

Ksepka：因此，就长角鸟而言，白垩纪时期的飞行爬行动物将担任这一特殊角色。

At the end-boundary of the Cretaceous period, a large asteroid likely crashed into shallow waters along the coast of modern-day Mexico.

在白垩纪末期，一颗大型小行星可能坠入现代墨西哥海岸的浅水区。

Some 65.5m years ago, at the end of the Cretaceous period, the Earth collided with an asteroid and the biggest terrestrial beasts in history were no more.

大约在6500万年前的白垩纪末期，地球与小行星相撞导致最大的陆地兽类全部灭绝。

It was during the Cretaceous period that a third major reptilian group began patrolling Mesozoic waters joining the Ichthyosaurs and Plesiosaurs.

正是在白垩纪时期，第三个主要的爬行动物群开始与鱼龙和蛇颈龙一起在中生代水域巡逻。

But this thick layer of Iridium that separates the Cretaceous and Tertiary periods clearly was an anomaly and it had been deposited over a very short time.

但这个隔开了白垩纪和第三纪的厚铱层显然是个异常事物，而且它在很多的时间内便沉积下来。

An asteroid about the size of Mount Everest, had struck the earth in the Yucatan Peninsula at the end of the Cretaceous period, 65 million years ago.

大小如同埃佛勒斯峰的小行星，在六千五百万年前白垩纪末期于尤卡坦半岛撞击到地球上。