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Yutang Formation
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Yutang Fm base reconstruction

Yutang Fm

Period: 
Neoproterozoic

Age Interval: 
Late Nanhuan or early Sinian (late Cryogenian or early Ediacaran). Nh or Z (10)


Province: 
Xinjiang

Type Locality and Naming

Tieklik region (SW Tarim Basin). The Yutang Fmwas named by Ma Shipeng et al. (1989). The type section is located on the west side of the Xinjiang-Tibet Highway, Qiakmakelik valley and Kelixi valley in Yecheng County, Xinjiang Weiwuerzhu Zizhiqu (Xinjiang Uygur Autonomous Region). Upper formation of the Qiakmakelik Gr.

Synonym:


Lithology and Thickness

The Yutang Fm consists of a series of interbedded dark-colored (gray-green, gray purple and purple) and gray white silty mudstone, shale (mudstone) and argillaceous siltstone and sandstone, with pebbly sandstone and one layer of marine and littoral sediments interbedded with glaciomarine sediments in upper part.

Thickness: The Yutang Formation is 741 m thick.


Lithology Pattern: 
Glacial till


Relationships and Distribution

Lower contact

The lower part of the formation is disconformable with the underlying Bolong Fm, unless an intervening Keliei Fm is present.

Upper contact

The top is disconformably overlain by the Kurkak Fm

Regional extent

Tieklik region (SW Tarim Basin). The Yutang Formation is distributed from Xuxugou, southwest of Yecheng County to Qiakmaklig valley and Kelixi valley on the west side of the Xinjiang-Tibet Highway, Maklikgou, south of Klixigou in Yecheng County and south of Pishan County, Xinjiang.


GeoJSON

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Fossils

A large amount of microplants have been found in this formation (26 genera, 33 species), such as: Baltisphaeridium sp., Micrhystridium sp., Dictyosphaera sp., Pseudodiacrodium sp., Fuchunshania cf. rarojugata, Tasmanites sp., Quadratimorpha sp Monotrematosphaeridium asperum,.


Age 

Late Nanhuan or early Sinian (late Cryogenian or early Ediacaran). Glacial till at top seems to suggest late Cryogenian (Marinoan glacial span used here for graphics); although might be Gaskiers?

Age Span: 

    Beginning stage: 
Cryogenian

    Fraction up in beginning stage: 
0.94

    Beginning date (Ma): 
640.10

    Ending stage: 
Cryogenian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
635.00

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.