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一、前言西藏南部侏罗系分布广泛,但研究程度较低。1966—1968年,中国科学院西藏科学考察队地层组,在珠穆朗玛峰地区科学考察,对聂拉木地区侏罗系进行了研究,初步建立了侏罗系地层系统,将聂拉木县土隆北,德日荣桥至普普嘎桥这段地层,确定为下侏罗统,最早命名为聂聂雄拉群下组(王义刚、张明亮,1974;赵金科,1976),后更名为普普嘎组(王义刚,1980),并作为喜马拉雅中段下侏罗统的代表剖面。组内已描述的菊石标本破碎。
I. Preface Jurassic in southern Tibet is widely distributed, but its research level is relatively low. 1966-1968, Chinese Academy of Sciences Tibetan scientific expedition strata group, in the Mount Everest region of scientific investigation of the Jurassic in Nyalam region was studied, the initial establishment of the Jurassic stratigraphic system, , German-Japanese Rongqiao to Pu Puga this strata, identified as the Lower Jurassic, the earliest named Nie Nie Xiong Lala group (Wang Yigang, Zhang Mingliang, 1974; Zhao Jinke, 1976), later renamed 普普嘎 group (Wang Yigang, 1980) and as a representative section of the Lower Jurassic in the middle Himalayas. The ammoniacal specimens described in the group were broken.