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Zhaowei Formation
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Zhaowei Fm base reconstruction

Zhaowei Fm

Period: 
Neoproterozoic

Age Interval: 
early Sinian (early Ediacaran), Z (27)


Province: 
Jiangsu, Anhui

Type Locality and Naming

North Anhui – Jiangsu border region. The Zhaowei Fm was named by the Jiangsu Party and Anhui Party of Regional Geological Survey (1976). The type section is located at Zhaowei Village, Yinzhuang Township, Tongshan County, Jiangsu Province. The Zhaowei Formation first appears in the Guidebook of 1: 200 000 Scale Geological Map of Xuzhou Sheet, which was published in 1978.

[Figure: Type section of the Zhaowei Fm]

Synonym: （赵圩组）


Lithology and Thickness

The Zhaowei Fm consists a Lower part of gray to blue gray thick-bedded limestone with stromatolitic limestone lenses, and an Upper part of blue gray, yellow-gray and purple thin- to medium-thick-bedded argillaceous banded limestone with stromatolitic limestone lenses. The thickness is quite variable, ranging from 637 m thick in Tushan, Chiming County, 286 m thick in Bashan, Pixian County, 212 m thick in sheep farm, Tongshan County, 75 m thick in Damiao, Shendian, and only 23 m thick in Mandingshan, Suxian County.


Lithology Pattern: 
Reef limestone


Relationships and Distribution

Lower contact

The Zhaowei Fm is conformable onto the underlying Jiayuan Fm

Upper contact

Conformable overlain by the Niuyuan Fm?

Regional extent

North Anhui – Jiangsu border region. The Zhaowei Formation is distributed like the Jiayuan Formation, which is developed in Suining, Pixian and Tongshan Counties, Jiangsu Province and Suxian County, Anhui Province.


GeoJSON

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Fossils

Stromatolites are Baicalia f., Tungussia f., Linella f. and Archaeozoon f. etc. Microplants have been found, such as: Trachysphaeridium minor, T. cultum, Margominuscula rugosa, Quadratimorpha sp., Leiofusa sp.


Age 

Lower (3 of 10) in a succession of eight formations spanning early through middle Sinian (early through middle Ediacaran) formations according to assigned "Z" code and schematic stratigraphic column.

Age Span: 

    Beginning stage: 
Ediacaran

    Fraction up in beginning stage: 
0.2

    Beginning date (Ma): 
615.76

    Ending stage: 
Ediacaran

    Fraction up in the ending stage: 
0.27

    Ending date (Ma):  
609.03

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.