acritarch

Not only most metazoan phyla made their debut at the earliest Cambrian, but also the fossil record like calcareous metaphyte flora and acritarch change dramatically nearly at the same time.

地球外部圈层的演替变化，诸如大陆重组、地磁极移、古气候、大洋地球化的变化以及大气氧量的变化等在时间一生命爆发事件有耦合关系。