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Huashishan Gr

Huashishan Gr

Period: 
Mesoproterozoic

Age Interval: 
Jixianian (Calymmian) Jx (12)


Province: 
Qinghai, Gansu

Type Locality and Naming

Eastern Qinghai-SE Gansu border region. The Huashishan Gr was established by the Regional Survey Team, Qinghai Province. Comprehensive Geological Party, Northwest Bureau of Geology, Ministry of Geology in 1964. The naming locality is at Huashishan, Huangzhong County, Qinghai Province.

Synonym: （化石山群）


Lithology and Thickness

The group is mainly composed of carbonate rock dominated by dolomite and siliceous-banded dolomite with minor slate and limestone. It is recorded for 3500 m thick.


Lithology Pattern: 
Dolomite


Relationships and Distribution

Lower contact

It disconformably overlies the Huangzhong Gr of the Changchengian System.

Upper contact

It is in unconformable contact with Middle Permian – the Bayinhe Gr (Lemengou Fm)

Regional extent

Eastern Qinghai-SE Gansu border region. The Huashishan Gr is concentrically distributed at Huajiu Mt. and Malaode Mt: of Gangcha County, Huashi Mt. of Huangzhong County, Laoye Mt. of Datong County, as well as at Nanmen Gorge and Songduo Mt. of Huzhu County, extending east into Yongdeng County, Gansu Province. Thus, it is distributed in a belt shape of roughly east-west direction.


GeoJSON

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Fossils

It contains stromatolites and microplants.


Age 

Schematic stratigraphic column shows it 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


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.