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1975年全国震旦系讨论会,根据近年来地层、古生物和同位素年龄的研究成果,认为南方震旦系和北方震旦系是上、下关系;并暂定南方震旦系(三峡层型剖面)称震旦系,北方震旦系(蓟县层型剖面)另建长城系、蓟县系、青白口系,与上述震旦系合称震旦亚界,归入上元古界。1976年出版的中华人民共和国地质图和亚洲地质图的元古代地层图例,即根据此方案编制的。这个方案虽是过渡性的,它对确定我国震旦亚界的地层层序,推动前寒武纪地层的深入研究,还是起了一定的积极作用。 不容讳言,对上述方案,有许多地质工作者曾表示不便反对,也不敢赞同。希望多做些工作,以求在实践中逐步统一认识,解决存在的问题。
According to the research results of strata, paleontology and isotopic ages in recent years, the National Seminar on Sinian System in 1975 considered that the Sinian system in the south and the Sinian system in the north are the upper and lower relations; and that the Sinian system in the south (the Three Gorges layer profile ) Said that the Sinian, Sinian Department of the North (Jixian stratigraphic section) and the other to build the Great Wall system, Jixian Department, Qingbaikou Department, together with the above Sinian Department jointly called the Sinian sub-community, classified as Proterozoic. The Proterozoic stratigraphy maps of the People’s Republic of China Geology Map and the Asian Geological Map published in 1976 are compiled under this program. Although this program is a transitional one, it still plays a positive role in determining the stratigraphic sequence of the Sinian sub-boundary in our country and promoting the in-depth study of the Precambrian strata. It is undeniable that many of the above geologists have expressed their opposition to and objection to the proposal. We hope that more work will be done in order to gradually unify our understanding and solve the existing problems in practice.