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Xinzha Formation

Xinzha Fm

Period: 
Carboniferous

Age Interval: 
C11 (43), early Early Carboniferous


Province: 
Gansu, Sichuan

Type Locality and Naming

The type section is located at Xinzha of Zharugou, Nanping County, Sichuan. It was named by Fan Yingnian in 1994.


Lithology and Thickness

Limestone. Dark-gray thin- to moderately thick-bedded crystalline limestone, with chert bands or nodules intercalated at bottom, and turning into dark-gray compact limestone and clayey limestone going along strike northward at Diebu. Thickness 150.3 m.


Lithology Pattern: 
Limestone


Relationships and Distribution

Lower contact

Conformable contact with the underlying Upper Devonian Dacaotan Gr (uppermost might be the Doushishan Fm => consistent with Devon column 51)

Upper contact

Conformable contact with the overlying Zharugou Fm

Regional extent


GeoJSON

null

Fossils

Corals Siphonophylloides stereoseptata, Kassinella longiseptata, K. raritabulata, Caninia cornucopiae ateles and Molophyllum vesicutum; Brachiopods Tenticospirifer sp., Iniathyris tykhtensis, Hunanospirifer sp., etc.


Age 

early Yanguanian = early Early Carboniferous

Age Span: 

    Beginning stage: 
Famennian

    Fraction up in beginning stage: 
0.75

    Beginning date (Ma): 
362.25

    Ending stage: 
Tournaisian

    Fraction up in the ending stage: 
0.2

    Ending date (Ma):  
356.79

Depositional setting

It is interpreted as platform margin slope deposits


Depositional pattern:  


Additional Information


Compiler:  

Fan Yingnian