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Weiji Formation
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Weiji Fm base reconstruction

Weiji Fm

Period: 
Neoproterozoic

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


Province: 
Jiangsu

Type Locality and Naming

North Anhui. The Weiji Formation was jointly named by the Jiangsu and Anhui Parties of Regional Geological Survey in 1976, which was first quoted in the Guidebook of 1: 200 000 Scale Geological Map of Xuzhou Sheet (1978). The Weiji Formation is located at Weiji-Baishan hills, Weiji Village, Tongshan County, Jiangsu Province.

Synonym: （魏集组）


Lithology and Thickness

The Weiji Fm consists of two parts. Lower part is gray medium- thick-bedded dolomite, dolomitic limestone and limestone interbedded with yellow green, blue gray shale and stromatolitic limestone lenses. Upper part is gray-purple limestone bearing stromatolites. The Weiji Formation is 211-319 m thick.


Lithology Pattern: 
Reef limestone


Relationships and Distribution

Lower contact

The Weiji Fm is conformable with the underlying Zhangqu Fm

Upper contact

Uncertain. Schematic stratigraphic column implies next younger regional unit is the Shijia Fm.

Regional extent

North Anhui. The Weiji Formation is mainly distributed in Suining and Tongshan counties, Jiangsu Province and Lingbi and Suxian counties, Anhui Province.


GeoJSON

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Fossils

Stromatolites are developed in both parts, such as: Baicalia cf. mauritanica, Linella weijiensis, Tungussia cf. erecta, T. kunlunensis, Gymnosolen cf. furcatus, Minjaria uralica, Jurusania f., Pseudokussiella f. ; Microplants: Pseudodiacrodium cf. tenerum; Macroscopic algae fossils: Chuaria circularis etc.


Age 

Upper-middle (7 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: 
0.5

    Beginning date (Ma): 
586.90

    Ending stage: 
Ediacaran

    Fraction up in the ending stage: 
0.57

    Ending date (Ma):  
580.17

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.