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Fengshanying Formation

Fengshanying Fm

Period: 
Mesoproterozoic

Age Interval: 
Yuxian (Stenian) Yx (35)


Province: 
Sichuan

Type Locality and Naming

Southernmost Sichuan. The Fengshanying Fm was named by Zhang Zhaojin in 1942. The type section is in Hongchuanqiao over Hetao River, Huili County, Sichuan Province. Uppermost formation in Huili Gr.

Synonym: （凤山营组）


Lithology and Thickness

The Fengshanying Fm is composed of grey, blue-grey thin-bedded to medium-thick-bedded muddy, sandy dolomite and limestone, banded limestone, occasionally stromatolite-bearing limestone. In the base are minor calcareous clastic rock. The thickness varies from 1720 m to 3262 m.


Lithology Pattern: 
Dolomitic limestone


Relationships and Distribution

Lower contact

The base is in conformable contact with underlying Limahe Fm, but locally in disconformable contact.

Upper contact

The top is in conformable contact with the overlying Tianbaoshan Fm (not in current Lexicon), but locally in disconformable contact.

Regional extent

Southernmost Sichuan.


GeoJSON

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Fossils


Age 

Schematic stratigraphic section gives span of late Yuxian (late Stenian).

Age Span: 

    Beginning stage: 
Stenian

    Fraction up in beginning stage: 
0.65

    Beginning date (Ma): 
1,070.00

    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.