最早的生命迹象发现存在于距今38亿年的太古代，但是地球上的生命在显生宙之前并不丰富。
Evidence for life has bee found in the Archaean about 3.8 billion years ago, but life did not become abundant until the Phanerozoic.
顶、底界线清晰，与下伏太古宙变质花岗岩系及上覆中元古界熊耳群均呈角度不整合接触。
Discordances existed between Fangniushan quartzite series and underlying Archean Eon metamorphic granite series, and overlying the Mesoproterozoic Era Xionger Group.
中国太古宙地体基本上分布在华北地台范围内，主要为花岗岩绿岩带。少部分为高级变质带。
China's Archeozoic Terrane, mainly a granite-greenstone belt, a small part of which been metamorphosed at a high grade, is basically located in North China Platform distributive area.
放牛山石英岩系为经低绿片岩相变质的粗陆源碎屑岩。顶、底界线清晰，与下伏太古宙变质花岗岩系及上覆中元古界熊耳群均呈角度不整合接触。
Fangniushan quartzite series consist of coarse terrigenous clastic rock which has been suffered the metamorphism of low green schist facies, contact lines of its top and base are distinct.
放牛山石英岩系为经低绿片岩相变质的粗陆源碎屑岩。顶、底界线清晰，与下伏太古宙变质花岗岩系及上覆中元古界熊耳群均呈角度不整合接触。
Fangniushan quartzite series consist of coarse terrigenous clastic rock which has been suffered the metamorphism of low green schist facies, contact lines of its top and base are distinct.
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