The discovery of conodonts from the first Member of the Xiangshan Formation in the Xiyi area, Baoshan, western Yunnan Province, and its biostratigraphic significance
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摘要:
保山西邑铅锌矿区香山组一段灰岩牙形石丰富，包括5属7种1个相似种及2个未定种，分别为：Ancyrodella curvata，A.nodosa，A.spp.，Ancyrognathus triangularis，Icriodus alternatus alternatus，I.sp.，Palmatolepis hassi，Pa.simpla，Polygnathus webbi，Po.cf.tenellus和Po.sp.。该牙形石组合面貌可与上泥盆统Late Palmatolepis rhenana带对比，表明研究区内香山组一段的时代为晚泥盆世弗拉斯期晚期，并非早石炭世。
Abstract:The first Member of Xiangshan Formation in the Xiyi Pb-Zn mining area of Baoshan is rich in conodont, and 5 genera, 7 species, 1 conformis species and 2 undetermined species were identified.They are:Ancyrodella curvata, A.nodosa, A.spp., Ancyrognathus triangularis, Icriodus alternatus alternatus, I.sp., Palmatolepis hassi, Pa.simpla, Polygnathus webbi, Po.cf.tenellus, and Po.sp..The conodonts assemblage is considered to be correlated with Late Palmatolepis rhenana zone, suggesting that the first Member of Xiangshan Formation is Late Frasnian of Late Devonian instead of Early Carboniferous in age.
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Keywords:
- Baoshan /
- Xiyi area /
- conodonts /
- Late Devonian
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致谢: 在编写阶段中国地质科学院地质研究所的季强研究员提供了化石鉴定资料；中国地质大学（北京）房强、沈阳博士在化石处理和文章写作过程中提供了帮助，黄晓宏、边春鹏、高昌峰和杨利超同学协助碎样，任卉和丁菱同学参与了样品挑选工作，在此表示感谢。
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图 1 西邑ZK-13井地理位置图
Figure 1. Sketch map showing the location of drill hole ZK8-13 in Xiyi
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图 2 西邑ZK8-13井牙形石分布
Figure 2. Distrubtion of conodonts in drill hole ZK8-13 in Xiyi area
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图 3 西邑ZK8-13井第39~43层上泥盆统牙形石时代
Figure 3. The age range of the Upper Devonian conodonts from bed 39 to bed 43 in drill hole ZK8-13 in Xiyi area
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