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在第二届全国地层会议(1979)以前,我国采用统一地层分类.华南区扬子分区上、下二叠统的界线,通常置于吴家坪组(滇黔川其底为峨嵋山玄武岩)与茅口组之间,代表这一界线的是有一明显的假整合面,即东吴运动.经多年实践,对其认识比较一致.而江南、东南分区却不尽然,将其置于堰桥组与孤峰组或童子岩组与文笔山组之间,还是置于龙潭组与堰桥组或翠屏山组与童子岩组
Before the Second National Stratum Conference (1979), China adopted a unified stratigraphic classification.The upper and lower Permian boundaries of the Yangzi subregion in South China are usually located between the Wujiaping Formation (Emei Mountain basalts at the bottom of Yunnan, Guizhou and Maokou) Between the groups, on behalf of this line is a clear fake integration, that is, the Soochow movement.After many years of practice, its understanding is more consistent.While the south, southeast partition is not necessarily, it will be placed in the weir bridge group and the Koho Group or between Tongziyan and Wenbi Mountain or between Longtan Formation and Yanqiao Formation or Mt. Cuiingshan Formation and Tongziyan Formation