在西藏改则县下东乡阿多嘎布下二叠统下拉组剖面野外实测中 ,根据岩性尤其是古生物组合特点 ,分析该剖面可能有上二叠统的存在 .室内大量古生物鉴定结果证实了这一野外推论的正确性 .这一发现表明 :“西藏冈底斯 念青唐古拉地区普通缺失上二叠统”的已有研究结论值得重新认识 .该组含有珊瑚、有孔虫、腕足、藻类等丰富的暖水型生物群化石 ,局部出现珊瑚、层孔虫点礁 .这一特点很好地反映了当时古特提斯域从高纬度又转变为低纬度的演化特征 . According to the characteristics of lithology, especially palaeozoic assemblage, the Upper Permian may exist in the field survey of the Lower Permian drop-down group in Adogarbu, Dongdong Township, A field corollary of the correctness of this finding shows that: “the Tibetan Gangidis Nyainqentangula common loss of the Upper Permian,” the existing research is worth re-understanding of the group contains coral, foraminifera, brachiopod, algae, etc. The abundance of warm-water biota fossils, corals and stomatal reefs appear locally, reflecting the evolution of the Guteethis domain from high latitudes to low latitudes at that time.