前寒武纪
前寒武纪（英语：Precambrian）是地质年代中，对于显生宙前头数个宙（eon）个非正式涵盖统称，原本正式个名称是隐生宙或隐生元（Cryptozoic eon），但后来拆分成冥古宙、太古宙搭元古宙三个时代。从大约45亿年前个地球形成时期开始，拉约5亿4200万年前大量肉眼可见个硬壳动物诞生个辰光结束。
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