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Qiongcuo Formation
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Qiongcuo Fm base reconstruction

Qiongcuo Fm

Period: 
Devonian

Age Interval: 
D1-2 (33), Early to Middle Devonian


Province: 
Sichuan

Type Locality and Naming

The type section is located at Niuchang of Zhongzha, Batang County, westernmost Sichuan Province near border with Tibet. It was named by No 3 Team of Sichuan Geological Survey in 1974 and was published in 1978 by Sichuan Compiling Group for Regional Stratigraphical Scale.

Synonym: Gongcuo Fm (pre-Pinyin?)


Lithology and Thickness

Limestone. The Qiongcuo Formation, 231 m thick, is composed of dark-gray to grayish-black thick-bedded or massive crystalline limestone partly intercalated with chert, with a 1-m-thick bed of sandstone at the base.


Lithology Pattern: 
Limestone


Relationships and Distribution

Lower contact

It is underlain by the Gerong Fm.

Upper contact

It is overlain by the Cangna Fm.

Regional extent

It is distributed in Selun and Batang of Sichuan and areas of Zhongdian (now called Shangri-La) of northeast Yunnan.


GeoJSON

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Fossils

It contains abundant coral Favosites spp. and Pachyfavosites spp., stromatoporoids and ostracods.


Age 

Early to Middle Devonian

Age Span: 
S

    Beginning stage: 
Emsian

    Fraction up in beginning stage: 
0.8

    Beginning date (Ma): 
397.54

    Ending stage: 
Eifelian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
385.30

Depositional setting

It is interpreted as a carbonate platform environment.


Depositional pattern:  


Additional Information


Compiler:  

(Xian Shiyuan)