AN APPROACH TO THE CONODONTS FROM XIAOSHIGAI SECTION AT THE BOUNDARY BETWEEN THE CAMBRIAN—ORDOVICIAN SYSTEMS, XIAOSHAN, ZHEJIANG PROVINCE

Conodonts discovered from Xiaoshigai section at the boundary between the Cambrian-Ordovician systems of Xiaoshan Region,Zhejiang Province are used to establish 4 con-odont fossil zones.The boundary bed is located between No.2 and No.3 zones,suggesting it is 30.7m upward than that of previously defined.It is considered that those fossil zones are comparable to the conodont zones of the corresponding beds at home,as well as consis-tent with the boundary decided by the International Work Group for the Cambrian-Or-dovician Boundary.Moreover,the color indexes of conodonts and their relationship with oil and gas are also discussed in the paper.