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苏皖北部上前寒武系发育良好,生物化石比较丰富,加之在大地构造上又处于中朝地台的东南缘,目前已成为解决我国南北上前寒武系对比和衔接的关键地区之一。为了进一步对苏皖北部上前寒武系进行深入研究,1981年夏我们和江苏省区测队、南京地质矿产研究所共同对徐淮地区上前寒武系剖面,进行了详细考察和系统采样。在徐淮地区,上前寒武系厚达4200米,以不整合覆于泰山群片麻岩之上,与含三虫叶的猴家山组(下寒武统)则呈平行不整合接触。根据苏皖两省地质局的工作成果,该区上前寒武系由下而上可划分为13个组,即兰陵组(八公山组)、新兴组(刘老碑组)、岠山组(寿县组)、贾园组、赵圩组、倪园组、九顶山组、张渠组、魏集组、史家组、望山组、金山寨组
The Precambrian in northern Jiangsu and Jiangsu developed well and its biological fossils were abundant. In addition, it was located on the southeastern margin of the platform of China-DPRK on the earth structure and has now become one of the key areas for resolving the contrast and convergence of the Precambrian in North and South China . In order to further study the Precambrian Pre-Cambrian in the northern part of Jiangsu and Anhui Provinces, we carried out a detailed investigation and systematic sampling of the pre-Cambrian section in Xuhuai area jointly with the Jiangsu Provincial Geological Survey and Nanjing Institute of Geology and Mineral Resources in the summer of 1981 . In Xuhuai area, the Upper Precambrian was 4,200 meters thick, with unconformities overlying the Taishan Group gneiss and with parallel unconformity contacts with the Houjiashan Formation (Lower Cambrian) containing trifoliate leaves. According to the results of the work of the Jiangsu-Anhui Provincial Bureau of Geology, the pre-Cambrian in the area can be divided into 13 groups from the bottom up, namely the Lanling Formation (Badagong Formation), the Xinxing Formation (Liu Laotu Formation) Mountain Group (Shouxian Formation), Jiayuan Formation, Zhaoxu Formation, Niyuan Formation, Jiudingshan Formation, Zhangqu Formation, Weiji Formation, Shijia Formation, Wangshan Formation, Jinshandai Formation