浙江省江山杨柳岗寒武—奥陶系界线附近牙形石的研究

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

丁连生 包德宪 曹海虹

Ding Liansheng Bao Dexian Cao Haihong

地质矿产部华东石油地质局地质研究大队

Geological Research Brigade under East China Bureau of Petroleum Geology, Ministry of Geology and Mineral Resources

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。

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.

https://doi.org/10.11781/sysydz198701074