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Chidantan Formation
Click to display on map of the Ancient World at:
Chidantan Fm base reconstruction

Chidantan Fm

Period: 
Permian

Age Interval: 
P3 (61), Wuchiapingian Stage of the Lopingian Epoch (Late Permian)


Province: 
Sichuan

Type Locality and Naming

The type section is located at Chidan Pond, Zhongzan Ox’farm, Batang County, Sichuan Province. It was named by the 3rd Regional Geological Survey Party under the Sichuan Geological Bureau in 1974.


Lithology and Thickness

Limestone: White massive limestone, pink dolomitic limestone, pebble-bearing sandy slate, conglomeratic limestone and a small amount of basalt. Thickness is 358-434 m.


Lithology Pattern: 
Dolomitic limestone


Relationships and Distribution

Lower contact

Conformable contact with the underlying Bingfeng Fm

Upper contact

Conformable contact with Early Triassic Cigang Fm

Regional extent

Distributed in the area of Derong, Batang County, Sichuan Province


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[99.4,30.3],[99.2,30.1],[99.3,29.6],[99.4,29.3],[99.8,29.1],[99.8,29.3],[99.6,30.3],[99.6,30.4],[99.4,30.3]]]]}}

Fossils

Yields faunas commonly found to occur in the Wuchiaping Fm of South China, including Fusulinida such as Reichelina, Codonofusiella, Eoverbeekina, Nankinella, and Sphaerulina; Brachiopods such as Squamularia, Cancrinella, Crurithyris and Martinia; as well as Corals such as Liangshanophyllum, Waagenophyllum, etc., with no standard members of the faunas of the Changhsingian Stage having been found.


Age 

Wuchiapingian Stage of the Lopingian Epoch

Age Span: 

    Beginning stage: 
Wuchiapingian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
259.55

    Ending stage: 
Wuchiapingian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
254.24

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wang Yujing

GeoJSON estimate by Can Cai and Xinyi Zhang (Chengdu Univ. Tech. students)