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Cangna Formation
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Cangna Fm base reconstruction

Cangna Fm

Period: 
Devonian

Age Interval: 
D2 (33), Middle Devonian


Province: 
Sichuan

Type Locality and Naming

The type section is located near Cangna of the Zhongza Cow farm in Batang County, westernmost Sichuan Province near border with Tibet. It was named by the Sichuan No. 3 Team of Regional Geological Survey in 1974 and was published by Sichuan Compiling Group for Regional Stratigraphical Scale (1978).


Lithology and Thickness

Limestone. The lithology of the formation is characterized by carbonate rock composed of light-gray to grayish-white medium-bedded to massive limestone and nodular Stromatopora-bearing reef limestone. The thickness is 230 m.


Lithology Pattern: 
Reef limestone


Relationships and Distribution

Lower contact

Conformable contact with the dark-gray medium-bedded crystalline limestone of the underlying Qiongcuo Fm.

Upper contact

Overlain by the dolomitic algae-bearing limestone of Talipo Fm.

Regional extent

It is distributed in Zhongza of Batang County, Genricuo of Xiangcheng County and Huorelaka of Baiyu County.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[99.84,30.56],[99.31,30.86],[99.1,29.48],[99.2,28.64],[99.75,27.88],[100.43,28.28],[100.27,29.46],[100.09,30.03],[99.84,30.56]]]]}}

Fossils

It contains abundant stromatoporoids


Age 

Middle Devonian

Age Span: 
S

    Beginning stage: 
Givetian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
385.30

    Ending stage: 
Givetian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
378.90

Depositional setting

It is interpreted as a shallow-water carbonate platform sedimentary environment.


Depositional pattern:  


Additional Information


Compiler:  

(Xian Siyuan)