浙江黄芝山剖面二叠-三叠系界线附近的牙形类序列及其地层对比

首次系统研究浙江黄芝山剖面二叠-三叠系界线附近的牙形类化石,共鉴定2属16种,并据此识别出5个牙形类化石带,从下至上依次为:Clarkina changxingensis changxingensis带,C.parasubcarinata带,C.chan-gxingensis yini-C.meishanensis zhangi带,C.meishanensis meishanensis带,Hindeodus parvus带。Hindeodus changxingensis,H.eurypyge,H.parvus分别在第15层、第18层底部、第18层中部依次出现,为确定该剖面二叠-三叠系界线在18-3层之底提供了依据。作者还讨论黄芝山剖面二叠-三叠系界线附近的牙形类序列与浙江煤山、伊朗剖面二叠-三叠系界线层牙形类序列的对比。

CONODONT SUCCESSION AROUND THE PERMIAN-TRIASSIC BOUNDARY AT THE HUANGZHISHAN SECTIoN,ZHEJIANG AND ITS STRATIGRAPHIC CORRELATION

Conodonts from the Permian-Triassic boundary beds at the Huangzhishan Section, Zhejiang are systematically studied for the first time, with a total of 16 species assigned to 2 genera. On the basis of the ranges of identified species, five conodont zones are recognized in ascending order as follows: the Clarkina changxingensis changxingensis Zone, the C. parasubcarinata Zone, the C. changxingensis yini-C. meishanensis zhangi Zone, the C. meishanensis meishanensis Zone, and the Hindeodus parvus Zone. The successive occurrences of Hindeodus changxingensis in Bed 15, Hindeodus eurypyge in the lower part of Bed 18 and Hindeodus parvus in the middle part of Bed 18 serve as proxies for defining the Permian-Triassic boundary at the base of Bed 18-3 in the Huangzhishan Section. Correlations with the stratotype Meishan Section, Zhejiang and sections in Iran are also discussed in terms of conodonts.