RESEARCH ON THE CONODONT NEAR THE BOUNDARY BETWEEN CAMBRIAN AND ORDOVICIAN SYSTEMS IN JIANGSHAN—YANGLIUGANG REGION, ZHEJIANG PROVINCE

Based on the discovery of condont fossils near the boundary between Cambrian and Ordovician systems on the Jiangshan-Yangligang Section in Zhejiang Province, three fossil assembledges Zone are defined in this paper as. 1. Proconodontus muelleri, 2. Cordylodus proavus, 3.Utahconus-Monocostodus sevierensis. The biostratigraphic boundary between Cambrian and Ordovician systems is placed between the assembledges Zone of Cor-dylodus proavus and Utahconus-Monocostodus sevierensis. The defined groups (assembledges) of conodonts can be compared not only with those both at home and sbroad, but also with macro-fossil assembledges(groups). Furthermore, the defined boundary is coincided with those made by international working group on the boundary of Cambrian-Ordovician systems which was decided by votes.