The Discovery of Conodont Fossils in Dahuoluo Area in Ganau and the Related Date Determination for Baiyunshan Formation

YU Jiyuan; WANG Guoqiang; ZHAO Guobin; JI Bo; LI Xiangmin; XIE Congrui; PENG Xuan

doi:10.12401/j.nwg.2023111

2024 Vol. 57, No. 5

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Article navigation > Northwestern Geology > 2024 > 57(5): 224-231

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YU Jiyuan, WANG Guoqiang, ZHAO Guobin, JI Bo, LI Xiangmin, XIE Congrui, PENG Xuan. 2024. The Discovery of Conodont Fossils in Dahuoluo Area in Ganau and the Related Date Determination for Baiyunshan Formation. Northwestern Geology, 57(5): 224-231. doi: 10.12401/j.nwg.2023111

Citation:

YU Jiyuan, WANG Guoqiang, ZHAO Guobin, JI Bo, LI Xiangmin, XIE Congrui, PENG Xuan. 2024. The Discovery of Conodont Fossils in Dahuoluo Area in Ganau and the Related Date Determination for Baiyunshan Formation. Northwestern Geology, 57(5): 224-231. doi: 10.12401/j.nwg.2023111

The Discovery of Conodont Fossils in Dahuoluo Area in Ganau and the Related Date Determination for Baiyunshan Formation

1.
Xi’an Center of China Geological Survey / Northwest China Center of Geosciences Innovation, Xi’an 710119, Shaanxi, China
2.
Orogen Research Center of China Geological Survey, Xi’an 710119, Shaanxi, China

Received Date: 13 January 2023

Revised Date: 18 July 2023

Accepted Date: 08 September 2023

Publish Date: 20 October 2024

Abstract

Abstract

The Baiyunshan Formation exposed in the Dahuoluo area of Beishan, Gansu Province is a set of clastic rock assemblages of slate, sandstone, glutenite, conglomerate, and locally intercalated limestone. Due to the lack of stratigraphic basis, it is classified as the Ordovician Xilinkebo Formation (a set of shallow marine sediments dominated by siliceous rocks, intercalated with limestone, sandstone and glutenite). Through field route geological survey and profile measurement, well-preserved conodont fossils have been obtained in the limestone interlayer of the Baiyunshan Formation. They are Periodon grandis, Protopanderodus sp., Drepanoistodus sp., Spinodus sp., Scabbardella sp., and the age of the rock assemblage is limited to the Late Ordovician. Based on the analysis of rock assemblage characteristics, sedimentary sequence and sedimentary facies, it is considered that the Baiyunshan Formation was formed in the piedmont foreland basin environment, indicating that the Beishan area has entered the initial orogenic stage in the Late Ordovician, which provides an important basis for improving the stratigraphic framework of Beishan.
- conodont /
- Baiyunshan Formation /
- sedimentary sequence and sedimentary facies /
- Late Ordovician /
- Beishan orogenic belt

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References

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