喜马拉雅地区一直是包括古生物学在内的多种学科研究的热门地区。三叠纪喜马拉雅地区沉积了大套连续完整的特提斯海相地层。文中系统描述了新采集自西藏喜马拉雅北坡聂拉木县土隆剖面的 Pinna yun-nanensis化石。这是 Pinna化石在该剖面的首次报道。通过对土隆剖面采集的菊石与标准菊石带对比，确定该化石的时代为诺利期(Norian)。另外，运用扫描电镜观察，对 Pinna 化石的壳质进行了埋藏学研究。化石的壳壁柱状层轮廓保存完整，珠母层文石全部重结晶。

The Himalayas have been important for a long time for many comprehensive studies including palaeontology．During the Triassic，a succession of Tethyian strata deposited in the Himalayas．This paper systematicaly describes the Pinna yunna-nensis fossils newly collected from Tulong section of Nyalam County，northern Himalaya， Tibet(Xizang)，which is the first report of Pinnafossils in this area．The ammonites from Tulong section are correlated to the standard ammonoid zone，which determines the age of the Pinnais Norian．In addition，the shell structure is observed under the Scanning Electron Microscope (SEM )for taphonomic study．The outline of the prismatic layer is recognizable，while the nacreous structure is hardly identifiable as the aragonite had been completely recrystallized．

国家自然科学基金(41472009，41602012)；中国科学院青年创新促进会项目联合资助