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思茅市之西约４０ｋｍ的小黑江畔龙洞河组底部，发现早二叠世早期Ｓｔｅｒｅｏｃｈｉａｌｉｔｏｓｔｙｌａ为主的腕足类组合及季节冰成因之杂砾岩，可以肯定龙洞河组属亲冈瓦纳相。龙洞河组与其上茅口期的大新山组为裂陷槽沉积，其中夹近大洋—大洋特点的玄武岩，与思茅地块的沉积截然不同。龙洞河与大新山地区应划归澜沧江带。冈瓦纳特提斯与扬子特提斯之间的界线，应由竹林乡—景谷一线通过，向北与北澜沧江—碧土带相连，向南与难河断裂相连。茅口晚期以后，在滇西，这一条界线又西移回至昌宁—孟连一线。
Simao City, about 40km west of the Xiaotonghe on the bottom of the Longdonghe Formation and found early Early Permian Stereochialitostyla-based brachiopods and seasonal ice genesis of conglomerate rock, you can be sure that the Longdonghe group is a pro-Gondwana phase. The Longdonghe Formation and the Daxunshan Formation on the Upper Maokou Period are characterized by rifted troughs. The basalts characterized by oceanic-oceanic features are distinctly different from the sediments of the Simao block. Longdong River and Daxin Mountain area should be assigned to the Lancang River. The boundary between Gondwanathitism and Yang Tethys should be approached by the line of Bamboo Grove - King Valley, northward and north of the Lancang River - the Bixi Belt, and to the south by the connection of the Difficult River. After the Maokou period, in western Yunnan, the boundary moved westward to Changning again - the Menglian front line.