寒武纪

Chen Huifang. 1991.Discovery of the old crystalline basement and komatiite on Hainan island.Geotectonica et Metallogenia,15(1) :62.

[1]陈惠芳.1991.海南岛前寒武结晶基底和科马提岩发现.大地构造与成矿,15(1):62.

The new framework, comprising a pre-trilobite series and three trilobite-dominated series, reflects the major evolutional stages of the life on Earth during Cambrian Period.

划分方案包括1“前三叶虫统”和3“三叶虫优势统”，反映了寒武生命发展主要阶段。

To the question why we do not find rich fossiliferous deposits belonging to these assumed earliest periods prior to the Cambrian system, I can give no satisfactory answer.

对于为什么我们没有发现大量属于寒武还要早时期化石，我无法给出满意答案。