ON THE PROBLEM OF THE DERINITION OF THE PENGHUOSHAN GROUP IN THE TANGGULA MOUNTAINS AREA,QINGHAI

Through many years of investigations by the Regional Geological Party of Qinghai province,plentiful lithos-tratigraphic and biosttatigraphic data have been accumulated about the Cretaceous Fenghuoshan Group on the north slope of the Tanggula Moutains in southern Qinghai. By means of sorting stratigraphic units the author revis-es the definition of the Fenghuoshan Group and the formation-rank lithostratigraphic units involved therein.