19世纪晚期，在地质学家对这些冰川沉积进行定位的时候，他们意识到有好几个漂流层，位置较低的对应的是更早的冰川期。
As geologists mapped glacial deposits in the late nineteenth century, they became aware that there were several layers of drift, the lower ones corresponding to earlier ice ages.
作为地质学家，我们研究地球表面的沉积层以估算过去地质时期的年代。
As geologists, we examine layers of sediment on the Earth' s surface to approximate the dates of past geologic time periods.
地质学家杰拉德·邦德注意到，一些沉积物颗粒被氧化铁染色，这表明它们起源于冰川覆盖红砂岩露头的地方。
Geologist Gerard Bond noticed that some of the sediment grains were stained with iron oxide, evidence that they originated in locales where glaciers had overrun outcrops of red sandstone.
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。
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.
地质学家关注沉积物，通过它们地质学家可以揭示过去，特别是在地球从一个地质年代跨越到另一个地质年代时那些巨大的时间跨度。
Geologists care about sediments, hammering away at them to uncover what they have to say about the past-especially the huge spans of time as the Earth passes from one geological period to another.
地质学家可用麦卡托投影来绘制古生界沉积中的水流方向。
Mercator might be used by a geologist mapping current directions in palaeozoic sediment.
在海洋地质调查中，如何取得好的沉积物样品是每一位海洋地质学家所向往的，而获得好的沉积物样品的关键又很大程度上取决于先进的海洋调查仪器的使用。
In a Marine geological survey, the key to obtaining good sediment samples is, to a very marked degree, decided by using what kinds of advanced Marine survey instruments.
溶解作用作为最为重要的建设性成岩作用是石油地质学家和沉积学家多年来长期研究的重要课题之一。
Dissolution is the most important constructive diagenesis, and many oil geology scientist pay many attention for it.
溶解作用作为最为重要的建设性成岩作用是石油地质学家和沉积学家多年来长期研究的重要课题之一。
Dissolution is the most important constructive diagenesis, and many oil geology scientist pay many attention for it.
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