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Shangshi Formation
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Shangshi Fm base reconstruction

Shangshi Fm

Period: 
Neoproterozoic

Age Interval: 
Early Nanhuan (latest Tonian-early Cryogenian), Nh (64)


Province: 
Jiangxi

Type Locality and Naming

West-central Jiangxi. The Shangshi Fm was named by the Jiangxi Party of Regional Geological Survey in 1965. The typical section is situated in Shangshi village (Tianxin Town) in Fenyi County, Jiangxi Province.

Synonym: （上施组）


Lithology and Thickness

With a variable lithology, the Shangshi Fm in the naming locality is dominated by greenish gray phyllite, intercalated with blasto fine-sandstone and sandy to silty phyllite, occasionally with carbonaceous sericite phyllite. The facies change southward to dark gray thick-bedded blasto-tuffite, occasionally with tuffaceous sandstone and sedimentary rhythmicity becomes clear northward, bearing graded beddings, ripple marks (sandstone), and laminations and cross-laminations (phyllite). It is more than 1560 m thick.


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

The Shangshi Fm rests unconformably on the underlying Shenshan Gr

Upper contact

It is disconformably overlain by the Xiafang Fm

Regional extent

Fenyi County, Jiangxi Province.


GeoJSON

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Fossils


Age 

Early Nanhuan (latest Tonian-early Cryogenian) on schematic stratigraphic chart.

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.8

    Beginning date (Ma): 
776.00

    Ending stage: 
Cryogenian

    Fraction up in the ending stage: 
0.4

    Ending date (Ma):  
686.00

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.