At the end of the Cretaceous, the geological record shows that these seaways retreated from the continents back into the major ocean basins.

地质记录显示，在白垩纪末期这些航道从大陆撤退，回到主要的海洋盆地。

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Several other mass extinctions in the geological record have been tentatively identified with large impacts, but none is so dramatic as the Cretaceous event.

地质记录中的其他几次大规模物种灭绝也被认为影响重大，但没有哪一次像白垩纪大灭绝那样夸张。

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While there are a dozen or more mass extinctions in the geological record, the Cretaceous mass extinction has always intrigued paleontologists because it marks the end of the age of the dinosaurs.

虽然在地质记录中有十几次甚至更多的大灭绝，但白垩纪的大灭绝总是引起古生物学家的兴趣，因为它标志着恐龙时代的结束。

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Instead, you have to turn to the geological record.

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Although there were no machines for detecting them systematically before 1935, cosmic rays have left their footprints in the geological record by creating radioactive elements such as the carbon-14 used in carbon-dating.

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The new date for the impact (66, 038, 000 years ago) narrows what's been dubbed the 'three metre gap' in the geological record between the demise of the dinosaurs and the asteroid impact to just 18, 000 years.

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