藏南聂拉木地区有关侏罗纪的地层及古生物的研究,前人己有报导。本文对该区的中、上侏罗统菊石的组合特征,并结合邻区及国外有关地区的菊石组合及其时代,将本区的菊石进一步划分为五个组合及一个菊石层。同时,对其上下层位关系与时代分布也作相应的讨论。一、地层概况及菊石组合划分 Previous studies have reported on the Jurassic stratigraphy and paleontology in the south of Nyalam region. In this paper, the combination characteristics of the Middle and Upper Jurassic ammonites in this area are combined with the combination of ammonification and its age in the adjacent areas and other relevant areas to further divide the ammonites in this area into five assemblages and one ammonite layer. At the same time, the relationship between the upper and lower strata and the distribution of the times are also discussed accordingly. First, stratigraphic and ammoniacal composition of the division