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陕西省洛南一带发育一套构造简单,层序清楚,基本未变质的晚前寒武纪地层,角度不整合于巨厚的熊耳群火山岩系之上,平行不整合于下寒武系辛集组含磷灰岩之下,总厚度近7000米。这套地层向西北、东南延伸,衔接华北地台南缘两端的上前寒武系,向北向南呼应蓟县、三峡两个上前寒武系层型,在我国上前寒武系的划分、对比、统一地层表的建立工作中,有着十分重要的地位。
A set of early Precambrian strata with simple structure, clear sequence and basically no metamorphism is developed in the area of Luonan in Shaanxi Province. The angle is not integrated with the huge volcanic rocks in the Xiong’er Group, and it is not parallel to the Lower Cambrian Xinji Formation Phosphorus limestone, the total thickness of nearly 7000 meters. This set of strata extends to the northwest and southeast, connects the Upper Precambrian at both ends of the southern margin of North China Platform, echoes northward from Jixian and the Three Gorges in the two Precambrian strata, and the division of Precambrian in China , The formation of a unified strata table, has a very important position.