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Mesoproterozoic

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Shengou Formation

Shengou Fm

Period: 
Mesoproterozoic

Age Interval: 
Xishanian (Ectasian) Xs (34)


Province: 
Sichuan

Type Locality and Naming

Mid-South Sichuan. The Shengou Fm was named in 1965 by the Southwest Geological Institute, Ministry of Geology. The type section is in Xiaoshengou, Dengxiangying, Xide County, Sichuan Province. It is the uppermost formation within the Mesoproterozoic portion of the Dengxiangying Gr.

Synonym: （深沟组）


Lithology and Thickness

Lower part is composed of interbedding of grey-white quartzite, metamorphosed quartz sandstone with minor sericite phyllite. Upper part is grey sericite phyllite with minor meta sandstone. The formation 1000-1400 m thick.


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

The base is in conformable contact with underlying Songlinping Fm (lowermost formation within the Dengxiangying Gr).

Upper contact

The top is conformably or disconformably overlain by the Zegu Fm.

Regional extent

Mid-South Sichuan. Xide County, Sichuan Province.


GeoJSON

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Fossils


Age 

The schematic stratigraphic column places Dengxiangying Gr as spanning Xishanian-Yuxian (Ectasian-Stenian), and each of its 5 formations are given equal spans for graphics.

Age Span: 

    Beginning stage: 
Ectasian

    Fraction up in beginning stage: 
0.4

    Beginning date (Ma): 
1,320.00

    Ending stage: 
Ectasian

    Fraction up in the ending stage: 
0.8

    Ending date (Ma):  
1,240.00

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Extracts from The Mesoproterozoic Erathem (chapter in Stratigraphic Lexicon of China, draft of 2022) by Gao Linzhi, Ding Xiaozhong, Zhang Chuanheng, Zhang Heng.