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华北地台南缘的东秦岭北坡中条山至乐山一带,出露一套晚前寒武纪未变质的碎屑岩及碳酸盐岩地层。自下而上分为汝阳群(云梦山组、白草坪组、北大尖组),洛峪群(崔庄组、三教堂组、洛峪口组),黄连垛组,董家组,罗圈组和东坡组。80年代初期,有人根据与汝阳群相当的高山河群中所发现的微古植物组合面貌,提出汝阳群可能相当于青白口系。但是,有相当多的人根据岩性对比、叠层石特征和部分同位素年龄资料认为汝阳群相当于长城系或蓟县系、笔者近年来对汝阳群进行了系统的微古植物和层序地层学研究,特别是对所发现的具刺疑源类进行了系统形态学、微细结构和分类的综合研究。
A series of Late Precambrian clastic rocks and carbonate strata are exposed in the area from Leshan Zhongshang to Leshan on the northern slope of East Qinling Mountains on the southern margin of North China Platform. From bottom to top, it was divided into Ruyang Group (Yunmengshan Formation, Baicaoping Group and Beidajian Formation), Luoyu Group (Cuihuang Formation, Sanchao Formation and Luoyukou Formation), Huangliantu Formation, Dongjia Formation, Luo circle group and Dongpo group. In the early 1980s, it was suggested that the Ruyang Group may be equivalent to the Qingbaikou system on the basis of the combination of the micro-paleoclimate found in the high mountain river group that corresponds to the Ruyang Group. However, quite a few people think that Ruyang Group is equivalent to the Great Wall series or Jixian series based on the lithology contrast, the characteristics of the stratigraphic rocks and the age of some isotopes. In recent years, the author has systematically studied the micro-flora and sequence of the Ruyang Group Stratigraphic studies, in particular, carried out a comprehensive study of the system morphology, microstructure and classification of the suspected spiked sources.