Age of the Upper Ordovician Koumenzi Formation in the Lenglongling area  of the North Qilian Mountain: The evidence from conodonts

CHEN Fenning; MENG Yong; BAI Xudong; LI Xiangmin; YU Jiyuan; WEI Xiaoyan; JI Bo

doi:10.19826/j.cnki.1009-3850.2022.06003

2024 Vol. 44, No. 1

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CHEN Fenning, MENG Yong, BAI Xudong, LI Xiangmin, YU Jiyuan, WEI Xiaoyan, JI Bo. 2024. Age of the Upper Ordovician Koumenzi Formation in the Lenglongling area of the North Qilian Mountain: The evidence from conodonts. Sedimentary Geology and Tethyan Geology, 44(1): 9-19. doi: 10.19826/j.cnki.1009-3850.2022.06003

Citation:

CHEN Fenning, MENG Yong, BAI Xudong, LI Xiangmin, YU Jiyuan, WEI Xiaoyan, JI Bo. 2024. Age of the Upper Ordovician Koumenzi Formation in the Lenglongling area of the North Qilian Mountain: The evidence from conodonts. Sedimentary Geology and Tethyan Geology, 44(1): 9-19. doi: 10.19826/j.cnki.1009-3850.2022.06003

Age of the Upper Ordovician Koumenzi Formation in the Lenglongling area of the North Qilian Mountain: The evidence from conodonts

1.
MNR, Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, Xi'an Center of Geological Survey, China Geological Survey, Xi'an 710054, China
2.
Center for Orogenic Belt Geology, CGS, Xi'an 710054, China
3.
Qinghai Institute of Geological Survey, Xining 810012, China

Received Date: 20 October 2021

Revised Date: 23 March 2022

Publish Date: 31 March 2024

Abstract

Abstract

Conodonts from the Upper Ordovician Koumenzi Formation in the Lenglongling area of the North Qilian Mountains are reported for the first time. Five genera and nine species of conodonts have been identified, including two undetermined species. On the basis of the characteristics of conodont fossil succession, a conodont assemblage has been established: the Aphelognathus grandis - Panderodus gracilis assemblage. We compared the conodont assemblages of the Koumenzi Formation with those at the same stratum at home and abroad. Combined with other fossil data for the Koumenzi Formation, the author concluded that the age of the Koumenzi Formation is the Kaidi-Middle Hernandian period, which is equivalent to the Late Aijiashan-Middle Qiantangjiang stage in the Chinese stratigraphic chronology.
- North Qilian /
- Late Ordovician /
- Koumenzi Formation /
- conodont assemblage

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References

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