The mass extinction would have occurred very suddenly under this hypothesis.

在这种假设下，大灭绝的发生是非常突然的。

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Scientists have linked the mass extinction at the end of the Cretaceous with a meteorite impact on Earth.

科学家将白垩纪末期的大灭绝与地球上的陨石撞击联系起来。

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Presumably, those environmental disasters could have been responsible for the mass extinction, including the death of the dinosaurs.

据推测，这些环境灾难可能是物种大规模灭绝的成因，包括恐龙的灭绝。

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Its detection at unearthly levels in rocks 65 million years old was the first evidence in the case for an asteroid causing the mass extinction and global environmental mayhem that ended the Cretaceous period and began the Tertiary period.

BBC: Leaving our mark: Fossils of the future

In truth, agreement on the cause of the mass extinction at the end of the Cretaceous (when not only the dinosaurs, but also a host of other species died) has never been as cut and dried among palaeontologists as it may have appeared to the public.

ECONOMIST: Mass extinctions

ABSTRACT:A REPORTER AT LARGE about the sixth mass extinction.

NEWYORKER: The Sixth Extinction?