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一、前言喜马拉雅地区侏罗、白垩系地层分布广泛,化石丰富,尤有丰富的菊石群。早在1903 —1910年乌利格(Uhlig)对喜马拉雅山西段侏罗、白垩系的菊石群做了详细的研究,对其地层做了初步的划分,为该区的工作奠定了一定的基础。对西藏喜马拉雅山区的中生代
I. Preface The Jurassic and Cretaceous strata in the Himalayas are widely distributed with rich fossils and especially abundant ammonite groups. As early as 1903-1910 Uhlig made a detailed study of the Jurassic and Cretaceous ammonites in the western part of the Himalayas and made a preliminary division of the strata that laid a solid foundation for the work in this area . Mesozoic to Tibet in the Himalayas