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江西早二叠世地层组段的划分仍沿用栖霞组、茅口组二分方案,不过界线有上、下之别。朱正刚等将安福县小江边村的小江边组置于茅口组下部与栖霞组为界,上覆狮子形组,提出了相应的Urushtenia chaoi-Chusenella tieni组合带。我们根据在整个坳陷内系统的地表地质工作,和大量的镜鉴成果,按岩性、岩相、沉积特征等,将下二叠统分为3个岩性段:即下部灰岩段,相当栖霞组;中部泥质岩(页岩)夹瘤状灰岩段,相当小江边组;上部
The division of the Early Permian stratigraphic group in Jiangxi Province still follows the Qixia Formation and the Maokou Formation. However, there is a distinction between upper and lower boundary lines. Zhu Zhenggang et al. Put the small river margin group of Xiaojiangbiancun in Anfu County into the lower part of the Maokou Formation and the Qixia Formation, overlying the Lion-shaped formation and proposed the corresponding Urushtenia chaoi-Chusenella tieni composite belt. Based on the surface geological work of the system in the whole depression and a great deal of mirroring results, we divide the Lower Permian into three lithologies according to the lithology, lithofacies and sedimentary characteristics: the lower limestone, Quite Qixia Formation; Central Argillaceous (shale) clayey limestones, rather small riverside group; Upper