One genetic study has traced its origins to the Late Cretaceous or Early Paleogene period.

一项遗传学研究将其起源追溯到白垩纪晚期纪早期。

Paleogene, the two periods whose boundary is marked by this event.

纪的德语缩写之后，这两个时期的边界 以该件标志。

This was the very beginning of the Paleogene Period, and the world was … kind of empty.

这是纪的 开端，世界… … 有点空虚。

This mass extinction event, known as the Cretaceous-Paleogene (K-Pg) extinction, saw the demise of about 75% of Earth's species, including all non-avian dinosaurs.

这次大规模件被称白垩纪-纪 (K-Pg) ，导致地球上约 75% 的物种，包括所有非鸟类恐龙。

To be precise, we will be going back 66 million years ago to an event known as The Cretaceous–Paleogene extinction event, which is also known as the Cretaceous–Tertiary or K–T extinction.

准确地说， 我们将回到 6600 万年前的白垩纪-纪件，也称白垩纪-第三纪 K-T 件。

At the end of the Cretaceous Period, a fatal blow struck the ammonites and most of the nautiloids: the Cretaceous-Paleogene extinction event -- the same event that killed the non-avian dinosaurs.

在白垩纪末期，一个致命的打击击中了菊石和大多数鹦鹉螺：白垩纪-纪件——与杀死非鸟类恐龙的件相同。

Well, the first thing to note is that the Cerrejon formation dates back to just a few million years after the Cretaceous-Paleogene extinction event that wiped out all of the non-avian dinosaurs and many other megafauna.

好吧，首先要注意的是，Cerrejon 地层的历史可以追溯到白垩纪-纪件之后的几百万年，这场件消了所有非鸟类恐龙和许多其他巨型动物。

Some parts  of the world were already scorching during the Late Cretaceous Period, the last great age of the  dinosaurs, but temperatures climbed even higher following a global catastrophe known as the  Cretaceous-Paleogene or K-Pg Extinction Event.

在白垩纪晚期，即恐龙的最后一个伟大时代， 世界上的一些地区已经变得炎热，但在一场被称白垩纪-纪 K-Pg 件的全球灾难之后， 气温甚至攀升得更高。