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。

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

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相比于大陆冰川沉积物，海洋沉积物提供了更完整的更新世时期的地质记录。

Ocean sediments presented a much more complete geologic record of the Pleistocene than continental glacial deposits did.

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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。

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

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