This idea was modified in the late twentieth century, when geologists and oceanographers examining oceanic sediment found fossil evidence of warming and cooling of the oceans.
在20世纪后期，地质学家和海洋学家在研究海洋沉积物时发现了能够证明海洋变暖和变冷的化石，并修正了这一观点。
These seas have a typical oceanic floor, except that the floor is overlaid by several kilometers of sediment.
这些海洋有一个典型的海底，只不过这个海底被几公里厚的沉积物覆盖。
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