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Beiwu Formation
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Beiwu Fm base reconstruction

Beiwu Fm

Period: 
Neoproterozoic

Age Interval: 
mid-Early Qingbaikouan (early Tonian), Qb （61）


Province: 
Zhejiang

Type Locality and Naming

North Zhejiang. The Beiwu Fm was named by the Party of Regional Geological Survey, Zhejiang Bureau of Geology and Mineral Resources in 1990 and published by Bao Chaomin in 1994. The type section is at Zhangcun and Beiwucun Villages, Fuyang City, Zhejiang Province. Middle formation of the Shuangxiwu Gr.

[Figure: Type section of the Beiwu Fm in Beiwu villeage, Fuyang County, Zhejiang Province]

Synonym: （北坞组）


Lithology and Thickness

The Beiwu Fm is composed mainly of schistose-altered dacitic pebbly vitroclastic tuff. The lower part is of andesitic brecciated tuff and tuffaceous siltstone. It is recorded as 433 m thick.


Lithology Pattern: 
Volcanic ash


Relationships and Distribution

Lower contact

Bottom is not seen. It is in fault contact with Pingshui Fm

Upper contact

It is in conformable contact with overlying Yanshan Fm

Regional extent

North Zhejiang.


GeoJSON

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Fossils


Age 

mid-Early Qingbaikouan (early Tonian) on schematic stratigraphic section.

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.1

    Beginning date (Ma): 
972.00

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
0.2

    Ending date (Ma):  
944.00

Depositional setting


Depositional pattern:  


Additional Information

A SHRIMP U-Pb data of 901.6±5.5 Ma (Gao Linzhi et al., 2014)


Compiler:  

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