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南段组和拉巴群出露于昌宁-孟连构造带内,是临沧地体的组成部分。通过南畔、阿里、南段、海邦和团结吊桥剖面研究,拉巴群可分为5个岩性段,归上石炭统至二叠系,南段组属下石炭统。临沧地体为一稳定的微陆块,二叠纪晚期增生到澜沧江岛弧的西缘。
The southern segment and the Laba group are exposed in the Changning-Menglian tectonic belt and are part of the Lincang Terrane. Through the study of the southern bank, the Ali section, the southern section, the Haibang section and the united drawbridge section, the Laba Group can be divided into five lithologic sections, which belong to the Carboniferous to Permian and the southern sections belong to the Carboniferous. Lincang terrane is a stable micro-continental block, and the late Permian accreted to the western edge of the Lancang River arc.