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Mesoproterozoic

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Dayingpan Formation

Dayingpan Fm

Period: 
Mesoproterozoic

Age Interval: 
Yuxian (Stenian) Yx (37)


Province: 
Yunnan, Sichuan

Type Locality and Naming

Central-north Yunnan (border with southernmost Sichuan). The Dayinpan Fm was named by Xie Zhenxi et al. in 1965. The reference section is in Xiaoheiqing-Puduhe area, in the Dongchuan Ore District, Yunnan Province. Lower formation-level stratigraphic unit of the Kunyang Gr in the Dongchuan area.

Synonym: （大营盘组）


Lithology and Thickness

Lower part of the formation is composed of black carbonaceous silty sericite slate, siliceous slate sandwiched with carbonaceous siltstone, but near the base it is of tuffaceous sandstone, lithic quartz sandstone, red ferruginous breccia and ferruginous slate and hematite layers or lenticules. Upper part consists of grey-black sericite slate with carbonaceous slate, but in the top, it is sandwiched with thin-bedded marl and quartz sandstone. Its thickness varies from 960 to 1216 m.


Lithology Pattern: 
Claystone


Relationships and Distribution

Lower contact

The base rests disconformably on the Qinglongshan Fm (Luzhijiang Fm)

Upper contact

The top is overlain conformably by the Xiaohekou Fm

Regional extent

Central-north Yunnan (border with southernmost Sichuan). The formation is mainly scattered in the Dongchuan area of Yunnan and the Huili area of Sichuan Province.


GeoJSON

null

Fossils

microplants: Pseudozonosphaera, Trachysphaeridium, Macroptycha, Lophosphaeridium.


Age 

Schematic stratigraphic column indicates that the Kunyang Gr spans the Yuxian (Stenian), and this is the upper of its three formations in the Dongchuan area.

Age Span: 

    Beginning stage: 
Stenian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
1,200.00

    Ending stage: 
Stenian

    Fraction up in the ending stage: 
0.35

    Ending date (Ma):  
1,130.00

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Extracts from The Mesoproterozoic Erathem (chapter in Stratigraphic Lexicon of China, draft of 2022) by Gao Linzhi, Ding Xiaozhong, Zhang Chuanheng, Zhang Heng.