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皖南的奥陶系有两种明显不同的沉积类型,分别属于两个不同的地层区,其分界线大致在宣城-石台一线,呈北东—南西方向延伸。在这一线的东南侧发育着以笔石页岩相为主的地层,属于江南地层区,而其西北侧发育着以介壳碳酸盐岩相为主的地层,属于扬子地层区。安徽省区测队对这两种沉积类型的过渡地带的地层及其沉积特征作了研究,
There are two distinctly different types of Ordovician sediments in southern Anhui, belonging to two different stratigraphic zones. The boundaries of the Ordovician are generally in the Xuancheng-Shitai line, extending in the north-east-south-west direction. On the southeastern side of this line, the stratum dominated by penolith shale belongs to the Jiangnan stratigraphic zone, while the northwest side of the strata is characterized by the carbonate-lithofacies-dominated strata, belonging to the Yangtze stratigraphic zone. The investigation team of Anhui Province made a study on the strata and sedimentary characteristics of the transitional zones of the two sedimentary types,