Early and Middle Ordovician chitinozoans from the Dapingian type sections, Yichang area, China - Archive ouverte HAL Access content directly
Journal Articles Review of Palaeobotany and Palynology Year : 2009

Early and Middle Ordovician chitinozoans from the Dapingian type sections, Yichang area, China

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Xiaohong Chen
  • Function : Author
Florentin Paris
  • Function : Author
  • PersonId : 840698
Xiaofeng Wang
  • Function : Author
Miao Zhang
  • Function : Author

Abstract

A detailed study of chitinozoans based on a systematic bed-by-bed sampling of the Dawan Formation was carried out in the Yichang area (West Hubei, China) on two representative sections located at Chenjiahe and at Huanghuachang, where the GSSP of the base of the Dapingian (i.e. the base of the Middle Ordovician) has been defined. Four chitinozoan zones, in ascending order the Conochitina raymondii biozone, the Conochitina langei biozone including the Lagenochitina lata and the Conochitina pseudocarinata sub-biozones, the Lagenochitina combazi biozone, and the Sagenachitina dapingensis biozone, are recognized in the Dawan Formation, which ranges in age from the Floian to the early Darriwilian. In both sections the chitinozoan biozones benefit from a direct calibration with conodont and graptolite biozones. The base of the Lagenochitina combazi biozone is very close, or coincides with, the base of the Dapingian, as defined by the FAD of the conodont B. triangularis. For global correlation purposes three important Ordovician chitinozoan genera, i.e. Belonechitina, Sagenachitina and Cyathochitina have their FAD in the Dapingian.
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insu-00374632 , version 1 (09-04-2009)

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Xiaohong Chen, Florentin Paris, Xiaofeng Wang, Miao Zhang. Early and Middle Ordovician chitinozoans from the Dapingian type sections, Yichang area, China. Review of Palaeobotany and Palynology, 2009, 153 (3-4), pp.310-330. ⟨10.1016/j.revpalbo.2008.09.006⟩. ⟨insu-00374632⟩
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