At the end of theCretaceous, 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。
2
Several other mass extinctions in the geological record have been tentatively identified with large impacts, but none is so dramatic as theCretaceous 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。
3
These animals were not as sensitive to climate changes in theCretaceous period as they are today.