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Qiziqiao Formation

Qiziqiao Fm

Period: 
Devonian

Age Interval: 
D22-D31 (68, 69), late Middle Devonian to early Late Devonian


Province: 
Hunan

Type Locality and Naming

The type section is located at Wanloushan Hill, Qiziqiao Village of Xiangxiang County, Hunan Province.

It was named by Tian Qijun, Wang Xiaoqing and Xu Yuandao in 1933.


Lithology and Thickness

Limestone. In the type area, it is 358 m thick and is composed of thick-bedded limestone intercalated with dolomite limestone and with dolostone in its lower part. The formation has a relatively persistent lithology and varies in thickness from 200 m to 1000 m.


Lithology Pattern: 
Dolomitic limestone


Relationships and Distribution

Lower contact

It rests conformably on the Yijiawan Fm, Huanggountang Fm and Tiaomajian Fm units.

Upper contact

It is overlain by Longkouchong Fm, Baqi Fm and Shetianqiao Fm, respectively, in different sedimentary regions.

Regional extent

Central Hunan


GeoJSON

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Fossils

The lower part yields brachiopod Stringocephalus burtini.


Age 

late Middle Devonian to early Late Devonian

Age Span: 

    Beginning stage: 
Givetian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
385.30

    Ending stage: 
Frasnian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
371.10

Depositional setting

The formation is characterized by carbonate rocks on the platform of central Hunan.


Depositional pattern:  


Additional Information


Compiler:  

(Tan Zenxiu)