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Wushinanshan Gr

Wushinanshan Gr

Period: 
Neoproterozoic

Age Interval: 
late Nanhuan-Sinian (late Cryogenian-Ediacaran), Nh-Z (7)


Province: 
Xinjiang

Type Locality and Naming

Aksu-Kalpin region. The Wushinanshan Gr was named by Zhang Tairong in 1977, which was published by Gao Zhenjia in 1985. The type section is located in the area of Qiaoenbulak-Sugetebulak of the southern hills of Wushi, south of Wushi County, Xinjiang Weiwuerzhu Zizhiqu (Xinjiang Uygur Autonomous Region).

Synonym: （乌什南山组）


Lithology and Thickness

The lithology of the Wushinanshan Gr is stable. It consists of three formations: The Lower formation, Yourmeinak Fm, consists of a suite of terrestrial glacial deposits (diamictite), which is roughly equivalent to the Nantuo Formation in Yangtze region. The Middle formation, Sugetbulak Fm, consists of purple-red sandstone. The Upper formation, Qigebulak Fm, is composed of carbonate rocks with clastic rocks.


Lithology Pattern: 
Sandstone


Relationships and Distribution

Lower contact

The lower part of the Gr (Yourmeinak Fm) lies disconformable or unconformable on the underlying Qiaoenbulak Gr (Dongwu Fm).

Upper contact

The Group is disconformably covered by the overlying Early Cambrian Yurtus Fm (Urutus Fm), which consists of phosphatic sediments. This break between them shows a small hiatus.

Regional extent

Aksu-Kalpin region. Wushi County, Xinjiang


GeoJSON

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Fossils


Age 

Late Nanhuan-Sinian (late Cryogenian-Ediacaran). Lowest unit (Yourmeinak Fm) of glacial till, which is indicated as coeval with Nantuo Fm, is assumed to be coeval with the late-Cryogenian Marinoan glacial.

Age Span: 

    Beginning stage: 
Cryogenian

    Fraction up in beginning stage: 
0.94

    Beginning date (Ma): 
640.10

    Ending stage: 
Ediacaran

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
538.80

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.