Some very ancient sediments were no longer recognizable, having been converted to igneous and metamorphic rocks in the course of mountain building.
在造山的过程中，一些非常古老的沉积物已被转化为火成岩和变质岩，已经无法辨认了。
However, if life once existed in surface environments, it is likely to have left behind a fossil record in ancient sediments now exposed at the surface.
然而，如果生命一旦在地表出现，他很有可能留下化石记录。这个记录可能是古沉积物形式保留在地表。
Biomarker has a wide application in the research of petroleum geology, such as different types of organics thermal evolution, ancient sediments' environment and so on.
摘要生物标志化合物在石油地质中应用广泛，可应用于源岩有机质类型和古沉积环境评价以及热演化阶段的确定等。
As the crust shifts, however, it can bring sediments containing ancient corpses back to the surface, where they decompose, removing oxygen from the atmosphere once more.
然而，由于地壳的变动，那些包含着古代动植物尸体的沉积物重新回到了地球表面，在那里他们分解，并又一次的从大气中吸取氧气。
Regions of the ancient lava field, which flowed from volcanoes 201.4m years ago, are preserved in sediments in Newark and Hartford, in the north-eastern US.
这些201.4万年前从火山口流下的古老熔岩被保存在美国东北部纽瓦克和哈特福德的沉积物中。
Dr Field’s team set about the task by analysing ancient records of birch pollen preserved in lake sediments from known mammoth breeding grounds like Siberia.
菲尔德博士的研究团队已经开始这项工作，在诸如西伯利亚等己知猛犸象的繁殖地点，他们对湖区沉淀物中保存的桦树花粉的远古信息进行了分析。
Dr Field's team set about the task by analysing ancient records of birch pollen preserved in lake sediments from known mammoth breeding grounds like Siberia.
菲尔德博士的研究团队已经开始这项工作，在诸如西伯利亚等己知猛犸象的繁殖地点，他们对湖区沉淀物中保存的桦树花粉的远古信息进行了分析。
Winds whipping across the Bodélé, a 10,000 square mile Saharan plain covered by ancient lakebed sediments, carry 700,000 tons of dust into the atmosphere annually.
Bodélé盆地，这个被古代湖底沉积物覆盖的撒哈拉平原，面积1万平方英里，每年横扫这里的大风会把70万吨沙尘送入大气中。
That species, Paranais litoralis, is part of an ancient family of worms called naidids that settle in thesoft sediments alongside streams and ponds.
这种物种称为沿岸拟仙女虫(Paranaislitoralis)，属于一种名为贫毛类(naidids)古老蠕虫家族的一部分，通常栖息在溪流池塘边沿的松软沉积物中。
Carbonate sediments in all environments are basically products of an ancient biochemical system.
一切环境的碳酸盐沉积物，基本上都是古代生物化学体系的产物。
In order to identify the ancient flood disaster events, it is significant to establish identification marks of sediments from the environment magnetism.
为了识别古洪灾事件，因而从环境磁学角度建立两种沉积物的识别标志是非常必要和有意义的。
"We reviewed data from 40 sites," he says, including evidence from ancient coral reefs, eroded beaches and telltale sediments laid down in the ebb and flow of 125,000-year-old tides.
“我们从40个站点浏览资料，”他说，包括从古珊瑚礁，被侵蚀的沙滩和一十二万五千年古老的潮汐留下的象征性的沉积物中。
"We reviewed data from 40 sites," he says, including evidence from ancient coral reefs, eroded beaches and telltale sediments laid down in the ebb and flow of 125,000-year-old tides.
“我们从40个站点浏览资料，”他说，包括从古珊瑚礁，被侵蚀的沙滩和一十二万五千年古老的潮汐留下的象征性的沉积物中。
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