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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。自下而上可分为汝阳群(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。关于汝阳群的时代归属及对比问题,一直存在争议。胡云绪等(1982)在系统研究了洛南地区,层位与白草坪组相当的高山河组微古植物后,发现其组合面貌与燕山地区青白口系微古植物组合面貌相似。因而,认为高山河组可与青白口系对比。武铁山(1982),梁玉左等(1984)主要根据
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 can be divided into Ruyang Group (Yunmengshan Formation, Baicaoping Formation and Beidajian Formation), Luoyuqun (Cuihuang Formation, Sanchao Formation and Luoyukou Formation), Huangliantu Formation, Dongjia Formation , Luo circle group and Dongpo group. There has been controversy over the age attribution and contrast of the Ruyang group. In a systematic study of the microflora of the Gaoshanhe Formation in the Luonan area and similar to the Baicaoping Formation, Hu Yunxu et al. (1982) found that the assemblage was similar to that of the Qingbaikou system in the Yanshan area. Therefore, it is believed that the Gaoshanhe Formation can be compared with the Qingbaikou system. Wu Tieshan (1982), Liang Yu left, etc. (1984) mainly based on