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Wugongkou Formation
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Wugongkou Fm base reconstruction

Wugongkou Fm

Period: 
Neoproterozoic

Age Interval: 
Early Sinian (early Ediacaran), Z (40)


Province: 
Sichuan

Type Locality and Naming

Sichuan south of Gansu. The Wugongkou Fm was named by the Second Geological Team of the Sichuan Bureau of Geology in 1977, and published in the Regional Geology of Sichuan in 1991. The naming section is located in Wugongkou, Mupi Township, Pingwu County, Sichuan Province.

Synonym: （蜈蚣口组）


Lithology and Thickness

The formation consists mainly of sericite quartz phyllite (slate), interbedded with minor thin-bedded meta-sandstone or crystalline limestone lenses. Along the strike, it changes into frequent alternating beds of thin-bedded crystallized limestone with sericitized quartz phyllite. It is 18-139 m thick.


Lithology Pattern: 
Shallow-marine marl


Relationships and Distribution

Lower contact

The formation is disconformable or unconformable onto the underlying ?Sinian (or Cryogenian glacial till) of the Muzuo Fm

Upper contact

It is conformably overlain by the Shuijing Fm

Regional extent

Sichuan south of Gansu. The formation is distributed in Motian, Houlongmen and Gongling mountains, Sichuan Province.


GeoJSON

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Fossils


Age 

Early Sinian (early Ediacaran) on schematic stratigraphic column

Age Span: 

    Beginning stage: 
Ediacaran

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
635.00

    Ending stage: 
Ediacaran

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
586.90

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

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