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Caodian Formation
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Caodian Fm base reconstruction

Caodian Fm

Period: 
Neoproterozoic

Age Interval: 
earliest Qingbaikouan (earliest Tonian), Qb （28）


Province: 
Anhui

Type Locality and Naming

North-central Anhui. The Caodian Fm was named by the Anhui Party of Regional Geological Survey in 1978. The typical section is situated at Dawushan northeast of Caodian, Fengyang County, Anhui Province.

Synonym: （曹店组）


Lithology and Thickness

The lower part of the Caodian Fm is composed of gray-white, grayish purple very thick-bedded quartzose conglomerate and ferruginous quartzose conglomerate, bearing a lot of poorly sorted, well-rounded and different sized pebbles (mainly 1 to 3 cm in diameter), which are dominated by quartzite, secondly by phyllite, schist and marble. The detritus are mostly derived from the underlying strata. The upper part, consist of purple thin-bedded ferruginous pebbly sandstone and ferruginous siltstone. When the iron is enriched, it can form a lenticular poor hematite ore. The thickness varies from 0 to 21 m.


Lithology Pattern: 
Aus conglomerate


Relationships and Distribution

Lower contact

The Caodian Fm overlies unconformably the sandy phyllite

Upper contact

Ferruginous phyllite of the underlying Songji Fm of Fengyang Gr.

Regional extent

North-central Anhui. It is limitedly exposed in Huainan to Fengyang and Huoqiu County


GeoJSON

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Fossils


Age 

earliest Qingbaikouan (earliest Tonian),

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
1,000.00

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
0.2

    Ending date (Ma):  
944.00

Depositional setting

The formation belongs to the deposit of the littoral shingle beach facies, the grain size generally showing a tendency to coarsening in lower part and to fine in upper part.


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.