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前寒

前寒前寒

前寒

例句：
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Chemical fossils (e. g. alkanes and porphyrins) are often the only evidence for life in rocks of PRECAMBRIAN age.
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The Precambrian metamorphic rocks in Northern Fujian are the important part consisting of the Cathaysian palaeocontinental basement.
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The first three eons, which together lasted nearly 4 billion years, are together known as the Precambrian.
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The Bogda Mountain, with Junggar basin on the north and Turpan-Hami basin on the south, is a part of the East Tianshan Mountains.
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Precambrian BIF iron ore deposit can be divided into two types, Algoma-type and Lake Superior-type.
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Among them the Precambrian and Cenozoic eras are the main metallogenic epochs in the world.
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This is illustrated by the fact that on Earth most of the Precambrian record is preserved in such lithologies.
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Selected Papers on Precambrian iron Deposits.
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The origin of lichens dated back to the Precambrian.
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The Precambrian crystalline rock series in the Yadong area is previously called "the Nyalam Group" .
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They are controlled by shear fracture belt of epimetamorphic rock series of Precambrian Period.
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After the Precambrian, there are three eras setting apart on their fossil records of dominant life.
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Fossil Records and Molecular Clock Study of the Time of Origin of the Precambrian Biologic Lineages
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