中文摘要：

首次在措勤县江让乡敌布错地区“下拉组”中发现了晚三叠世诺利阶的高舟牙形石。这表明在该地区下拉组中至少有一部分是以前没有被识别出的晚三叠世诺利阶地层，这套地层暂时命名为江让组。更重要的是，剖面中江让组之上舍植物化石的碎屑岩地层可能是区域上广泛分布的敌布错组。江让组高舟牙形石的发现对敌布错组及其所含植物群的时代提出了质疑。

英文摘要：

Late Triassic Norian Epigondolella is first found in the ‘Xiala Formation＇ m the Dibu Co area, Coqen County, Tibet. The discovery of Epigondolella suggests that at least some of the ‘Xiala Formation＇ in the study area should be Late Triassic Norian strata which were not recognized before. The limestone containing Epigondolella is temporarily named the Gyangrang Formation. More importantly, the overlying claztic strata containing plant fossils is probably the Dibu Co Formation, which is widespread in the region. The discovery of Epigondolella in the Gyangrang Formation challenges the age of the Dibu Co Formation and its flora.