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Surkuli Gr
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Surkuli Gr base reconstruction

Surkuli Gr

Period: 
Neoproterozoic

Age Interval: 
Qingbaikouan (Tonian), Qb (12)


Province: 
Xinjiang

Type Locality and Naming

Altun Mtns. The Surkuli Gr was named by Li Tiande et al. in 1991 and formally published by Liao Changquan 1993. The typical section is situated in the south slope of the Altun Mountain in the boundary of Qinghai Province and Xinjiang Weiwuerzhu Zizhiqu (Xinjiang Uygur Autonomous Region).

Synonym: （索尔库里群）


Lithology and Thickness

The Surkuli Gr is a suite of crystalline schist and marble, dominated by white gray thick-bedded marble and calcareous schist, slate, phyllite and biotite-quartz schist. It is more than 1850 m thick.


Lithology Pattern: 
Clayey limestone


Relationships and Distribution

Lower contact

It overlies unconformably the underlying Taxidaban Gr (Jixian System).

Upper contact

It is unconformably overlain by the Ordovician Elantag Fm

Regional extent

Altun Mtns. The Surkuli Group is mainly distributed in the south slope of the Altun Mountain (in Bashikaogong, Lapeiquan, Kumutashilik and Nurbak) in Xinjiang.


GeoJSON

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Fossils

It yields abundant stromatolites of Conophyton, etc.


Age 

Shown as spanning Qingbaikouan (Tonian) on stratigraphic chart.

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
1,000.00

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
0.8

    Ending date (Ma):  
776.00

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.