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Banqiao Formation
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Banqiao Fm base reconstruction

Banqiao Fm

Period: 
Neoproterozoic

Age Interval: 
Middle Qingbaikouan (middle Tonian), Qb (60)


Province: 
Anhui, Jiangxi

Type Locality and Naming

Southernmost Anhui. The Banqiao Fm was named by the Geological Department of Nanjing University in 1958 and published by Xia Bangdong in 1962. The reference section is the Jinzipai section in Qimen County, Anhui Province. Formerly in lower Shangxi Gr, then transferred to upper Shuangqiaoshan Gr.

Synonym: （板桥组）


Lithology and Thickness

Lower part of Banqiao Fm consists of rhythmic interbedding of silty slate with slate. Middle part is composed of interbedding of phyllitic siltstone with sandy slate. Upper part is slate, silty slate and phyllitic siltstone. The lower part was often injected with the intermediate acid dikes along bedding. The formation is over 3000 m thick.


Lithology Pattern: 
Claystone


Relationships and Distribution

Lower contact

It is in conformable contact with the overlying Mukeng Fm

Upper contact

It is in conformable contact with the underlying Zhangqian Fm

Regional extent

Southernmost Anhui and northeast Jiangxi. It mainly developed in Qimen County, southern Anhui Province and extends westward to Jiangxi Province.


GeoJSON

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Fossils

The slate yields microplants, such as: Leiopsophosphaera, Polyporata, Taeniatum.


Age 

Middle Qingbaikouan (middle Tonian) implied by relative stratigraphic position. [Not on schematic stratigraphic columns.]

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.3

    Beginning date (Ma): 
916.00

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
0.4

    Ending date (Ma):  
888.00

Depositional setting


Depositional pattern:  


Additional Information

A SHRIMP U-Pb data of 832 Ma (Gao et al., 2010)


Compiler:  

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