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.
Tiemannite has been discovered in the Qiongmo micro-disseminated gold deposit occuring in the Cambrian silicalite and slate in the southern subzone of the Western Qinling Mountains.
With stromatolite but no desiccation crack, the depositional environment of Middle-Late Cambrian in the area was intertidal zone to subtidal zone with the shallow-water features.
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.
Even there are different views about the Tan-Lu Fault’s characters, the author think that the Tan-Lu Fault is a huge transcurrent fault which was formed after the Cambrian.