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Yukengou Formation
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Yukengou Fm base reconstruction

Yukengou Fm

Period: 
Neoproterozoic

Age Interval: 
early Sinian (early Ediacaran), Z (9)


Province: 
Xinjiang

Type Locality and Naming

Kuruktag region. The Yukengou Fm was named by E. Norin. The type section (E87°32′30″; N41°26′09″) is located in Yukengou area on the southern side of the west tip of Kuruktag, Xinjiang Weiwuerzhu Zizhiqu (Xinjiang Uygur Autonomous Region). The reference section is located at the Zhaobi Mountain in central Kuruktag, Xinjiang Weiwuerzhu Zizhiqu (Xinjiang Uygur Autonomous Region). Upper-middle formation of the Kuruktag Gr (7 of 9).

Synonym: （育肯沟组） Yukkenggol Fm; 克根库都克组（岩系）, Kegenkuduke Fm (Rock Series).


Lithology and Thickness

The Yukengou Fm is a series of clastic rocks composed of uneven interbedded thin-bedded dark gray, gray-green siltstone, silty shale, shale (laminated slate) with calcareous siltstone and with minor muddy unstable interbeds of marl, fine-grained sandstone and feldspathic quartz sandstone, with the latter showing brown coloration. The Yukengou Formation is 210-350 m thick, locally 583 m thick (central Kuruktag).

[Figure: Stratigraphic Column of the Kuruktag Gr]


Lithology Pattern: 
Siltstone


Relationships and Distribution

Lower contact

The Yukengou Fm is conformable with the underlying Zhamokti Fm

Upper contact

The Yukengou Fm is conformable with the overlying Shuiquan Fm

Regional extent

Kuruktag region. The Yukengou Formation is widespread from Yukengou east of Korla in southwest tip of the eastern Kuruktag to the northern slope of Xingditag, Moqingkuduk, Luoqinbulak, Zhaobi Mt. (Central Kuruktag), and eastward to Yulegunbulak (eastern Kuruktag) south of Shanshan County.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[90.32,42.55],[90.24,42.72],[91.35,42.7],[92.61,42.59],[93.77,42.21],[94.43,41.8],[93.74,40.83],[92.87,40.56],[91.78,40.28],[89.64,40.07],[90.44,40.92],[90.97,41.64],[90.84,42.17],[90.32,42.55]]]]}}

Fossils

Abundant microplants have been found in this formation, such as: Trachysphaeridium incrassatum, T. rude, T. cultum, T. simples, Pseudozonosphaera asperella, P. rugosa, P. uerrucosa, P. nucleolata and Asperatopsophosphaera umishanensis.


Age 

early Sinian (early Ediacaran),

Age Span: 

    Beginning stage: 
Ediacaran

    Fraction up in beginning stage: 
0.2

    Beginning date (Ma): 
615.76

    Ending stage: 
Ediacaran

    Fraction up in the ending stage: 
0.4

    Ending date (Ma):  
596.52

Depositional setting

The Yukengou Formation clastic rocks were deposited in the deeper part of a continental margin.


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.