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河北唐山——卢龙地区寒武—奥陶系界线地层的牙形刺及其重要属种的演化

王志浩 方一亭   

  1. 中国科学院南京地质古生物研究所
  • 收稿日期:1996-12-20 修回日期:1996-12-20 出版日期:1996-12-20 发布日期:1996-12-20

CONODONTS OF CAMBRIAN-ORDOVICIAN BOUNDARY IN TANGSHAN-LULONG AREA, HEBEI AND PHYLOGENY OF SOME IMPORTANT SPECIES

Wang Zhihao1, Fang Yiting2   

  1. 1. Nanjing Institute of Geology and Palaeontology, Academia Sinica; 2. Department of Earth Science, Nanjing University
  • Received:1996-12-20 Revised:1996-12-20 Online:1996-12-20 Published:1996-12-20

摘要: 本文对唐山和卢龙地区寒武-奥陶系界线地层中的牙形刺再次进行研究,厘定了过去报道的一些重要属性,并对最具地层间意义的Cardylodus的几个种的演化进行了分析。指出了该属的两个进化系列,第一支进化系列是Eoconodontus notchpeakensis-Cordylodws primitivus-C. intermermedius-C.angulatus;而另一支则是Eoconodontus notchpeakensis-C. caboti-C. prolindstromi-C. lindstromi-C. prion.本文对寒武-奥陶系分界线的几个划分方案也进行了简单的讨论。

Abstract: The present paper restudies the conodonts of Cambrian-Ordovician boundary from Tangshan-Lulong area, Hebei province. An evolutionary sequence of Eoconodontus notchpeakensis through Cordylodus primitivus, C.proavus, C. caboti, C. intermedius to C. angulatus is recognized here. Several proposals for the Cambrian- Ordovician boundary based on the evolution of Cordylodus are also discussed in this paper.