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Mesoproterozoic

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Binggou Gr

Binggou Gr

Period: 
Mesoproterozoic

Age Interval: 
Jixianian (Calymmian) Jx (14)


Province: 
Qinghai

Type Locality and Naming

East-central Qinghai (South margin of Qaidam Basin). The Binggou Gr was named by the No.111 Geological Party of the Petroleum Management Bureau, Qinghai Province in 1959. The type locality is Binggou gully, Dulan County, Qinghai Province.

Synonym: （冰沟群）


Lithology and Thickness

The group is a set of slightly metamorphosed magnesian carbonate rock strata, mainly of siliceous-banded dolomite, crystalline limestone intercalated with siltstone, slate, with locally intermediate-basic volcanic rock. The Binggou Gr is rich in stromatolites and microplants. The formation is 6000 m thick


Lithology Pattern: 
Dolomitic limestone


Relationships and Distribution

Lower contact

It is disconformably underlain by the Xiaomiao Gr of Changchengian.

Upper contact

It is in unconformable contact with Qiujidonggou Gr of Neoproterozoic

Regional extent

East-central Qinghai (South margin of Qaidam Basin). The group is distributed mainly in the south margin of Qaidam Basin.


GeoJSON

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Fossils

Stromatolites: Baicalia rara, Colonnella discreta, Kussiella cf. enigmatica, Minjaria f., Tungussia f. Microplants: Trematosphaeridium minutum, Quadratimorpha sp..


Age 

Schematic stratigraphic column shows it spanning the 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


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.