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Xuchika Formation

Xuchika Fm

Period: 
Carboniferous

Age Interval: 
C1 (37), late Early Carboniferous


Province: 
Sichuan

Type Locality and Naming

The type section is located at Baxiangling-Dingpo of Zhongzan cattle farm, 90 km southeast of Batang County, Sichuan. It was named by the No. 3 Regional Geological Survey Party of Sichuan Bureau of Geology in 1972.


Lithology and Thickness

Limestone. The lower (?) part consists of gray and light-gray massive crystalline limestones, locally with ooids and intermittent siliceous bands; the upper (? – original text also said 'lower') part is of flesh-red, light-gray and gray-white thin- to moderately thick-bedded compact limestones, locally with oolitic textures. 112.62−161.16 m thick.


Lithology Pattern: 
Limestone


Relationships and Distribution

Lower contact

Conformable contact with the underlying Baxiangling Fm

Upper contact

Conformable contact with the overlying Zhapu Fm

Regional extent

Distributed along Zhongzan, Derong and Xiangcheng of Batang, Sichuan


GeoJSON

null

Fossils

Upper (?) part yields Corals Dibunophyllum sp., Arachnolasma sinense, Corwenia cf. rugosa and Kueichouphyllum sp.; Fusulinids Eostaffella irenae, etc.,


Age 

late Visean to Namurian of the late Early Carboniferous

Age Span: 

    Beginning stage: 
Visean

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
346.73

    Ending stage: 
Serpukhovian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
323.40

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Fan Yingnian