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Xiaoping Formation
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Xiaoping Fm base reconstruction

Xiaoping Fm

Period: 
Neoproterozoic

Age Interval: 
Qb (44?)


Province: 
Sichuan

Type Locality and Naming

Southernmost Sichuan. The Xiaoping Fm was named by Yang Xianhe in 1976, The naming section extends from Xinjietian to Xingping (Beds No. 8-12), Yanbian County, Sichuan Province. Upper-middle formation of Yanbian Gr.

Synonym: （小坪组）


Lithology and Thickness

The formation is composed of dark-grey sericite slate, sandy slate, carbonaceous sericite slate, sandwiched with meta-sandstone and carbonaceous slate. The base consists of thick-bedded metamorphosed tuffaceous fine conglomerate and meta-sandstone. Graded beds are developed in the formation and convolute bedding and undulating erosion surfaces are recognized within it. The formation is 2260 m thick.


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

It is in conformable contact with underlying Yumen Fm

Upper contact

The top is disconformably covered by the Zhagu Fm

Regional extent

Southernmost Sichuan. It is distributed mainly around Yalang, and Xiaoping, Yanbian County, Sichuan Province.


GeoJSON

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Fossils


Age 

middle Qingbaikouan (middle Tonian)

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.4

    Beginning date (Ma): 
888.00

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
0.6

    Ending date (Ma):  
832.00

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.