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Yifeng Formation

Yifeng Fm

Period: 
Neoproterozoic

Age Interval: 
earliest Qingbaikouan (earliest Tonian), Qb (put with 63)


Province: 
Jiangxi

Type Locality and Naming

Northwest Jiangxi. The Yifeng Fm was named by the Party of Regional Geological Survey, Jiangxi Bureau of Geology in 1977. The naming section is in Shangshanli-Caoshang Villages, Yifeng County, Jiangxi Province. Synonym: Yifeng Gr.

Synonym: （宜丰组）


Lithology and Thickness

The formation is dominated by muddy and sandy rocks, which were metamorphosed to schist, accompanied with diabase, spilite or basic lava, quartz keratophyre. The thickness varies from 614 m to 1688 m.


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

The base is conformably transitional into the underlying Hengyong Fm (Xijiang Fm). [Regionally in NW Jiangxi, the next older unit might also be the Xinzi Gr?]

Upper contact

The top is conformably transitional into overlying Xiushui Fm (Caoshang Fm). [Regionally in NW Jiangxi, the next younger unit might also be the Shangshuangjiaoshan Gr?]

Regional extent

It is developed in Yifeng County, Jiangxi. According to the consideration of Jiangxi Bureau of Geology and Mineral Resources (1997), the formation is roughly equivalent to Jilin Fm plus Anlelin Fm of the Shuangqioshan Gr in the Zhanggong District.


GeoJSON

null

Fossils


Age 

SHRIMP U-PB age on zircon of 850 ±10 Ma (Jiangxi Bureau of Geology and Mineral Resources (2012). [Assigned here as earliest Qingbaikouan (earliest Tonian), coeval with Jilin Fm and Anleling Fm of Column 60 on schematic stratigraphic chart of southernmost Anhui-NW Jiangxi.]

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.1

    Beginning date (Ma): 
972.00

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
0.2

    Ending date (Ma):  
944.00

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.