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Zhangqu Formation
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Zhangqu Fm base reconstruction

Zhangqu Fm

Period: 
Neoproterozoic

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


Province: 
Anhui, Jiangsu

Type Locality and Naming

North Anhui. The Zhangqu Formation is named by the Jiangsu Party and Anhui Party of Regional Geological Survey (1976). The type section is located near Longshan of Zhangqu Village, Jiuding Township, Lingbi County, Anhui Province. The Zhangqu Formation first appears in the Guidebook of 1: 200 000 Scale Geological Map of Xuzhou Sheet, which is published in 1978.

Synonym: （张渠组）

[Figure: Type section of the Zhangqu Fm]


Lithology and Thickness

The Zhangqu Fm consists of two parts: Lower part of gray thin- medium- thick bedded limestone interbedded with purple red calcareous shale and marl with the thin-bedded limestone showing rib-like bands after weathering. Upper part of gray medium- to thick-bedded crystalline dolomite interbedded with argillaceous limestone, calcareous shale and oolitic limestone with wavy beddings and bird's-eye structures. The formation is 294- 362 m thick.


Lithology Pattern: 
Clayey limestone


Relationships and Distribution

Lower contact

Edge-wise calcirudite of the bottom is conformable with the underlying Jiudingshan Fm

Upper contact

Conformably overlain by the Weiji Fm

Regional extent

North Anhui. The Zhangqu Formation is distributed in the Jiuding Hills, Lingbi County, Anhui Province, and in Shendian, Weiji, Tongshan County, Jiangsu Province.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[116.94,34.46],[117.37,34.45],[118.05,34.39],[118.13,34.24],[117.97,33.91],[117.63,33.61],[117.16,33.5],[116.8,33.62],[116.64,34.13],[116.94,34.46]]]]}}

Fossils

Stromatolites: Minjaria nimbifera, Acaciella f., Pseudokussiella f., Baicalia f., Tungussia f. etc. Microplants: Siphonophycus sp., Trachysphaeridium sp., Michystridium sp. and triangular calcareous sponge-spicules.


Age 

Upper-middle (6 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: 
0.42

    Beginning date (Ma): 
594.60

    Ending stage: 
Ediacaran

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
586.90

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.