In the late Cretaceous period, temperatures inexplicably began to climb.

在晚白垩纪时期气温莫名地又开始攀升。

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。

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。

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。

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 mid-Cretaceous period, the world's environment was changing globally.

白垩纪中叶正值全球环境不断变化的时期。

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。

That is fair enough. Such landscapes were common during the beasts' heydays, the Jurassic and Cretaceous periods.

这很合理，因为这样的景观在侏罗纪和白垩纪的野兽鼎盛时期很常见。

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。

The climate changes of the later Cretaceous period were the beginning of the end.

晚白垩纪时期的气候变化是终结的开始。