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Shangliang Formation

Shangliang Fm

Period: 
Mesoproterozoic

Age Interval: 
Xishanian-Yuxian (Ectasian-Stenian), Jx – Yx (26)


Province: 
Sichuan, Shaanxi

Type Locality and Naming

Northeast Sichuan-Southwest Shaanxi. The Shangliang Fm was named by the Daxian County Party of Geology, Sichuan Bureau of Geology in 1960. The type section is in Yangba and Zhongjia-maopozi, Nanjiang County, Sichuan Province. It is the upper formation of the Huodiya Gr.

Synonym:


Lithology and Thickness

The formation is subdivided into lower, middle and upper parts. Lower part is composed of metamorphosed volcanic rock, volcanic tuffaceous clastic rock and marble, forming several eruptive-sedimentary cycles of 200 m thick. Middle part is grey- dark- grey calcareous slate with marble and crystalline limestone, grading up-ward to the intercalating of limestone with slate, 760 m thick. Upper part is dark- grey, black- grey sericite slate intercalated with marble and carbonaceous slate; 450-940 m thick.


Lithology Pattern: 
Shallow-marine marl


Relationships and Distribution

Lower contact

It is in conformable contact with the underlying Mawozi Fm (the lower formation of the Houdiya Gr).

Upper contact

The top is unconformably covered by the Tiechuanshan Fm.

Regional extent

Northeast Sichuan-Southwest Shaanxi. The formation is mainly distributed in Wangcang and Nanjiang counties, Sichuan Province.


GeoJSON

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Fossils


Age 

Schematic stratigraphic section suggests span of Xishanian through Yuxian (Ectasian through Stenian).

Age Span: 

    Beginning stage: 
Ectasian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
1,400.00

    Ending stage: 
Stenian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
1,000.00

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.