The Reserch On Biostratigraphy And Discuss The Chronostratigraphy Boundary In Permian At The Ganzhai Section(Pingtang, Guizhou Provine)

Systematic and detailed biostratigraphic research is focused on fossil from Upper Carboniferous-Lower Triassic section at Ganzhai (P ingtang, G uizhou Provine) . Received a large number of fossil of fusulinid,foraminifera .After laboratory analysis and Identification of the fossil ,author divided them into several fossil zones ,and accurately determined their boundaries.Enhanced the accuracy of study on biostratigraphy at this region from Carboniferous-Lower Triassic section. The study laid the foundation for Precision study multi-strata and international comparison.Apart from the study of fossil of fusulinid,f oraminifera, author also collected some conodont samples nearby the Permian-Triassic boundary. 8 species of conodont are identified from 274th strata, 10 species of conodont are identified from 277th strata, i n strata, only 2 species of conodont are identified.Which conodonts found from 274th strata are belong Permian ,we also found the representative conodont of changsingian in the 274th strata.In addition, some conodonts from 277th and 278th strata which time is limited to early Triassic. Some representative conodonts of changsingian also be found in the 277th strata.The division of the Permian-Triassic boundary is according to the three groups conodonts identification results.Moreover,2 samples of ammonite were been found from the 273th strat a: Altudiceras and Pseudotirolites. The age of Altudiceras is Permian ,and Pseudotirolites is the representation fossil of Late Permian.This paper combin the identification results of different species of fossils ,and according to the lithostratigraphic uni t ,devided the chronostratigraphy unit.For a long time,the Scholars of China laid the boundary of C\T in the Qixia bottom.This boundary is much higher than international's.This paper use international method to devided Permian into 3 Series :Chuanshanian,Yangxinian,Lopingian ,and 8 St ages :Zisongian,Longlinian,Luodianian,Xianboan,Kuhfengian,Lengwuan,Wuchiapingian,Changsingian.According to the theory of Multiple Stratigraphic Classification ,the Lithostratigraphic unit boundaries of Ganzhai section of Upper Carboniferous-Lower Triassic have been revised a nd divided into 7 Fromation : Maping Fm,Liangshan Fm,Qixia Fm,Maokou Fm,Heshan Fm,Dalong Fm,Feixianguan Fm.Comparison the boundaries of Lithostratigraphic unit with Bio-stratigraphic units and Chronostratigraphi c units ,we found that Maping Fm is a strata which belong to uper Xiaodushanian~lower Zisongian.The Qixia Fm and Maokou Fm are also diachronic.