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Shaohuotonggou Formation
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Shaohuotonggou Fm base reconstruction

Shaohuotonggou Fm

Period: 
Neoproterozoic

Age Interval: 
Nanhuan (Cryogenian), Nh (15)


Province: 
Gansu, Inner Mongolia

Type Locality and Naming

Longshou Mts. (border central Gansu to Inner Mongolia). The Shaohuotonggou Fm was named by Zhao Xiangsheng et al. in 1980. The typical section is situated in Shaohuotong valley in Alxa Youqi, Inner Mongolia. Lower formation of the Hanmushan Gr

Synonym: （烧火筒沟组）


Lithology and Thickness

Lowermost part is a greenish yellow tillite (diamictite). Middle to upper part consists of pebbly phyllite (pebbly claystone), silty phyllite and sericite phyllite (dominated by greenish gray to grayish purple muddy conglomerate, pebbly phyllite and slate, occasionally with pebbly sandstone and sandy dolomite, etc.). Thickness is about 800 m.


Lithology Pattern: 
Glacial till


Relationships and Distribution

Lower contact

The lowermost part, a bed of gray diamictite, unconformably overlies the underlying Dunzigou Fm of Jixian age

Upper contact

The top, 2 m of greenish gray silty slate, is disconformably overlain by the Caodaban Fm

Regional extent

Longshou Mts. (border central Gansu to Inner Mongolia). This formation is dominantly distributed in Hanmushan, Hongyashan, Qingshishan (in Yongchang County, Gansu Province), Shaohuoshaotong and Mafangzi valleys (in Alxa Youqi, Inner Mongolia).


GeoJSON

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Fossils


Age 

Nanhuan (Cryogenian) is suggested on the schematic stratigraphic column. For graphic purposes, the lower tillite is assumed coeval with the Sturtian glacial.

Age Span: 

    Beginning stage: 
Cryogenian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
720.00

    Ending stage: 
Cryogenian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
635.00

Depositional setting


Depositional pattern:  


Additional Information

Some researchers (e. g. Li Wenyuan, 1991) hold that the pebbly dolomite in the Shaohuotonggou Formation was probably derived from debris flows of marine carbonate rock and did not come from the glacial sediments.


Compiler:  

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