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Beijiangjun Formation

Beijiangjun Fm

Period: 
Mesoproterozoic

Age Interval: 
Jixianian (Calymmian) Jx (22)


Province: 
Anhui

Type Locality and Naming

East-central Anhui. The Beijiangjun Fm was named by the Party of Regional Geological Survey, Anhui Bureau of Geology in 1977. The type section is in Beijiangjun Mt. of Zhangbaling area, west of Chuzhou City, Anhui Province. Lowermost formation in Zhangbaling Gr.

Synonym: （北将军组）


Lithology and Thickness

The Beijiangjun Fm consists of phyllite and schist series, whose protoliths may be a flysch formation. Lower part is mainly composed of dolomitic marble, sandwiched with phyllite, calcareous phyllite and minor meta-sandstone. The phyllite increases upward. Upper part is of blackish green, yellow green sericite quartz phyllite intercalated with chlorite-sericite phyllite, sericite phyllite and minor sericite quartz schist. The formation is 1239 m thick.


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

The basal contact with the underlying Paleoproterozoic Feidong Gr is unknown.

Upper contact

It has a conformable contact with Xileng Fm.

Regional extent

East-central Anhui. It is stable in lithological character and distributed basically in the Zhanbaling Range area, west of Chuzhou City.


GeoJSON

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Fossils


Age 

Schematic stratigraphy column displays as spanning Jixianian (Calymmian).

Age Span: 

    Beginning stage: 
Calymmian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
1,600.00

    Ending stage: 
Calymmian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
1,400.00

Depositional setting

Protoliths may be a flysch


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.