RESEARCH ON THE CONODONT NEAR THE BOUNDARY BETWEEN CAMBRIAN AND ORDOVICIAN SYSTEMS IN JIANGSHAN—YANGLIUGANG REGION, ZHEJIANG PROVINCE
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摘要: 本文将在浙江省江山杨柳岗剖面中所发现的寒武—奥陶系界线附近的牙形石,划分为三个化石带,所建立的化石带可与国内外牙形石带对比,并可与大化石带相对比,所确定的地层界线,与国际寒武—奥陶系界线工作组投票决定的界限一致。Abstract: 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.
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