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Xifengsi Formation
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Xifengsi Fm base reconstruction

Xifengsi Fm

Period: 
Neoproterozoic

Age Interval: 
Sinian (Ediacaran), Z (61)


Province: 
Zhejiang

Type Locality and Naming

North-central Zhejiang. The Xifengsi Fm was named by Sheng Xinfu (S. F. Sheng) in 1951. The naming section is located in Changshan County and Shaojiashan of Zhuji City, Zhejiang Province.

Synonym: （西峰寺组） , Xifengxi (spelling variant)


Lithology and Thickness

The Xifengsi Fm is subdivided into three parts. In the bottom of the Lower member consists of manganiferous dolomite or dolomitic limestone, upwards, there are mainly gray green, purple-red siltstone, black carbonaceous siliceous shale and black shale. Middle and Upper members are mainly gray, black gray dolomite. The upper member changes a lot. In Changhua Anji area on the north, the upper member consists of siliceous rocks, and going southward to Kaihua-Linan area, it changes to argillaceous dolomite with chert or siliceous mudstone.


Lithology Pattern: 
Dolomite


Relationships and Distribution

Lower contact

Overlies the Leigongwu Fm on schematic stratigraphic column.

Upper contact

Overlain by Cambrian-age Hetang Fm on schematic stratigraphic column.

Regional extent

North-central Zhejiang.


GeoJSON

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Fossils

Microplants are Monotremaatosphaeridium asperum, Trachysphaeri- dium sp., Leiopsophosphaera sp., Leiofusa sp., Archaeohystrichosphaeridium sp., Granomarginata sp., Cymatiosphaera sp.; In Jiangshan-Shaoxing area, some stromatolites occur in dolomite, such as: Boxonia f., Jacutophyton f., Kussiella f., Jurusania f., Baicalia f., Conophyton f., Collenia f., Cryptozoon f.


Age 

Sinian (Ediacaran) on schematic stratigraphic column.

Age Span: 

    Beginning stage: 
Ediacaran

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
635.00

    Ending stage: 
Ediacaran

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
538.80

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.