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Yuxi Formation
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Yuxi Fm base reconstruction

Yuxi Fm

Period: 
Neoproterozoic

Age Interval: 
late-Early Qingbaikouan (early Tonian), Qb (57)


Province: 
Guangxi

Type Locality and Naming

Northern Guangxi. The Yuxi Fm was named by the Party of Regional Geological Survey, Guangxi Bureau of Geology in 1968. The naming section is located in Yuxi Village, Huangjin, Luocheng County, Guangxi Zhuangzhu Zizhiqu (Guangxi Zhuang Autonomous Region). The formation is the upper stratigraphic unit of the Sipu Gr.

Synonym: （鱼西组）


Lithology and Thickness

It is composed mainly of grey, greyish and grey-yellow or dark grey thin-bedded meta-sandstone, siltstone, calcareous sandstone, feldspar-quartz sandstone and sericite slate (sometimes phyllite), forming rhythmic beds. It is sandwiched locally with tuff in band shapes with oblique bedding in middle and lower parts. The formation is 1500 m thick.


Lithology Pattern: 
Fine-grained sandstone


Relationships and Distribution

Lower contact

It is in conformable contact with underlying Wentong Fm of the same Sipu Gr.

Upper contact

The top is unconformably overlapped by Baizhu Fm of the Danzhou Gr.

Regional extent

Northern Guangxi. It is distributed in Luocheng and Rongshui counties, northern Guangxi.


GeoJSON

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Fossils


Age 

Zircon from the granodiorite massif intruded in the formation (which is unconformably covered by Danzhou Gr) was U-Pb dated at 834±4 Ma (Gao Linzhi et al., 2014). Late-Early Qingbaikouan (early Tonian) on schematic stratigraphic section.

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.25

    Beginning date (Ma): 
930.00

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
0.4

    Ending date (Ma):  
888.00

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.