滇西云县-景洪一带广泛分布的火山地层是古特提斯构造域南澜沧江构造带的重要组成部分，其时代的准确限定对理解古特提斯大洋俯冲、闭合以及陆内造山等演化过程具有重要意义，但是区域上对该套火山地层的时代和岩石地层划分仍存在争议。本项目拟选取滇西景谷地区火山地层内丰富的陆相叶肢介化石、海陆混合生物化石以及中酸性熔岩为研究对象，将生物地层学和锆石U-Pb同位素年代学研究相结合，准确限定该地区火山地层时代。在此基础上，以海、陆混合生物群为“桥梁”，探讨叶肢介生物地层与海相生物地层的对比关系，为中-晚三叠世海陆相地层对比研究提供新资料。

The widely distributed volcanostratigraphic in the Yunxian-Jinghong area of western Yunnan is an important part of the Paleotethyan suture Lancangjiang tectonic zone. The accurate definition of its age has important implications for understanding the evolution of the ancient Tethys ocean, such as subduction, closure, and intracontinental orogeny, however, the age of the strata and the division of lithostratigraphy are controversial. This project is planned to document the rich terrestrial conchostracans, mixed marine-terrestrial biota and medium-acid lava in the volcanostratigraphic of the Jinggu area in western Yunnan. We try to define the age of volcanostratigraphic accurately, base on the study of biostratigraphy and zircon U-Pb isotopic geochronology. In addition, this study focuses on the co-preserved conchostracans and marine fossils in the mixed marine-terrestrial biota, which were regarded as a intermediate link for the middle-late Triassic biostratigraphic correlation between terrestrial and marine sequences.