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Badaojiang Formation
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Badaojiang Fm base reconstruction

Badaojiang Fm

Period: 
Neoproterozoic

Age Interval: 
Sinian (Ediacaran), Z （23）


Province: 
Jilin

Type Locality and Naming

Southeast Jilin. The Badaojiang Fm was named by the Jinan (southern Jilin) Team of Regional Geology of Changchun College of Geology in 1960 and was published by Yu Jianzhang et al., in 1964. The typical section is located at Qinggouzi of Badaojiang 15 km south of Hunjiang City (the city is now named Baishan City), Jilin Province.

[Figure: Type section of Badaojiang Fm]

Synonym: （八道江组）


Lithology and Thickness

The Badaojiang Formation is composed of light gray clastic limestone and stromatolite-bearing limestone, which is subdivided into three lithological members. Lower member is composed of light gray medium- to thick-bedded algal limestone and stromatolite-bearing limestone, intercalated with three beds of chert. Middle member is gray-white thick-bedded limestone, stromatolite-bearing limestone. Upper member is light gray thick-bedded stromatolite-bearing limestone. The total thickness varies from 289 m to 586 m.


Lithology Pattern: 
Reef limestone


Relationships and Distribution

Lower contact

The lowermost part conformably overlies the Wanlong Fm with a layer of siliceous limestone.

Upper contact

The upper part is characterized by thick-bedded stromatolite-bearing limestone that is conformably below the overlying Qinggouzi Fm.

Regional extent

Southeast Jilin. The Badaojiang Fm is mainly distributed in the basin of Hunjiang river, Yalu and Santong river.


GeoJSON

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Fossils

It yields stromatolites: Badaojiangella badoajiangensis, Baicalia aimica, Colonnella f., Gymnosolen f., Inzeria f., Jurusania f. etc. Microplants: Trachysphaeridium sp., Asperatopsophosphaera umishanensis, Trematosphaeridium sp., T. minor, Polyporata obsolete etc.


Age 

Sinian (Ediacaran) in literature; but shown as late-Cryogenian on schematic stratigraphic section. Used lower-middle Sinian here.

Age Span: 

    Beginning stage: 
Ediacaran

    Fraction up in beginning stage: 
0.2

    Beginning date (Ma): 
615.76

    Ending stage: 
Ediacaran

    Fraction up in the ending stage: 
0.4

    Ending date (Ma):  
596.52

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.