Two main glacial epochs affected both areas during the last 100 million years of Precambrian times.
在前寒武纪的最后1亿年中，两个主要的冰川时期对两个地区都产生了影响。
柯林斯例句
Gneiss, a metamorphic rock, can be commonly found in Precambrian areas.
片麻岩, 变质岩, 可以发现,在常见的前寒武纪地区.
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Precambrian time for as much as eighty - five percent of all geological time.
从前寒 武 世纪以来地球地面大部分被冰川所覆盖的任何地质年代.
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Early - Precambrian rocks are widely exposed in Dunhuang - Beishan area, GansuProvince.
甘肃敦煌 - 北山地区广泛出露早前寒武纪岩石.
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Rapakivi is a special rock in Precambrian.
环斑花岗岩是发育于前寒武纪的一种特殊岩石.
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Late Precambrian mafic dyke swarms are extensively developed in the central North China Craton.
华北克拉通中部广泛发育晚前寒武纪镁铁质岩墙群.
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Of , belonging to, or designating the earlier of two divisions of the Precambrian era.
(地质学)在前寒武纪后半部分形成的.
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Precambrian time accounts for as much as eighty - five percent of all geological time.
前寒武纪占据了整个地质年代的百分之85.
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They are in fact metamorphosed rocks , predominantly schist , amphibolites, granites and sand stones and Muruwa Precambrian.
事实上,它们主要由地片岩、闪岩 、 花岗岩和细沙,小石头变质而来.
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Among them the Precambrian and Cenozoic eras are the main metallogenic epoches in the world.
就全球而言,前寒武纪和新生代是金矿的重要成矿期.
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They are controlled by shear fracture belt of epimetamorphic rock series of Precambrian Period.
主要赋存于前寒武纪浅变质岩系中,受剪切断裂带控制.
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The oldest rocks in the concession area belong to the Guyana and are of Precambrian age.
最古老的岩石层在圭亚那雨林,它们的年龄可以追述到前寒武纪.
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In the world a lot of gold deposits occur in the early Precambrian greenstone belts.
早前寒武纪花岗岩—绿岩地体中赋存着丰富的金矿床.我国绿岩带主要分布在华北陆台,也是重要的含金岩系.
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