显然，在某些时候，来自北冰洋最北端的更多冰山赶在融化沉积前向南漂入北大西洋。

At certain times, apparently, more icebergs from the Arctic Ocean in the far north were traveling south well into the North Atlantic before melting and shedding their sediment.

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事实上，海洋无脊椎动物不变的外壳是通过1亿年前的沉积物发现的。

Indeed, unaltered shells of marine invertebrates are known from deposits over 100 million years old.

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尤卡坦半岛上富含铱的沉积层和一个巨大的陨石坑提供了证据，证明了约6500万年前，一颗大型陨石撞击了地球。

An iridium-enriched sediment layer and a large impact crater in the Yucatn provide evidence that a large meteorite struck Earth about 65 million years ago.

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