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Tuqiaozi Formation
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Tuqiaozi Fm base reconstruction

Tuqiaozi Fm

Period: 
Devonian

Age Interval: 
D31 (70), Frasnian (early Late Devonian)


Province: 
Sichuan

Type Locality and Naming

The type section is located nearby Village Tuqiaozi of Beichuan County, Sichuan. It was named by Chen Yuanren in 1978.


Lithology and Thickness

Limestone. This formation is dominated by thin- to medium-bedded grayish-black bioclastic micritic limestone, nodular bioclastic limestone and clayey micritic limestone intercalated with shale. It is 223 m thick.


Lithology Pattern: 
Clayey limestone


Relationships and Distribution

Lower contact

It conformably rests on the Guanwushan Fm.

Upper contact

It is conformably overlain by the Xiaollingpo Fm.

Regional extent


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[104.82,32.52],[103.31,31.15],[104.36,30.74],[105.65,32.27],[104.82,32.52]]]]}}

Fossils

It yields brachiopods Leiorhynchus spp., Striatopugnax triplicata, Gypidula beichuanensis; coral Peneckiella shawoziensis, Paranalivtinella irregulare; conodonts Polygnathus asymmetricus asymmetricus, P. alatus; and tentaculites Decricoconus veschovensis, Homoctenus cf. longiconica, Corona petrovi etc.


Age 

Frasnian (early Late Devonian)

Age Span: 
S

    Beginning stage: 
Frasnian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
378.90

    Ending stage: 
Frasnian

    Fraction up in the ending stage: 
0.3

    Ending date (Ma):  
376.56

Depositional setting

Carbonate shelf


Depositional pattern:  


Additional Information


Compiler:  

(Wang Shitao)