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.
球外部圈层的演替变化,诸如
陆重组、
磁极移、古气候、
球化学性质的变化以及
气氧
量的变化等在时间上与这一生
事件有耦合关系。