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Xiaolingpo Formation
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Xiaolingpo Fm base reconstruction

Xiaolingpo Fm

Period: 
Devonian

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


Province: 
Sichuan

Type Locality and Naming

The type section is located at Xiaolingpo near Tuqiaozi Village along the highway from Ganxi to Shawuzi Town in Beichuan County, Sichuan Province. It was named by Hou Hongfei and others in 1985.


Lithology and Thickness

Reefal limestone. The Formation is characterized by grayish-white amphiporoid-bearing limestone, reefal limestone, algal-laminated and oncolite limestone. The formation is 266 m thick.


Lithology Pattern: 
Reef limestone


Relationships and Distribution

Lower contact

It is distinguished from underlying Tuqiaozi Fm by the appearance of a 40-cm-thick bed of algal-laminated limestone.

Upper contact

Conformable contact with the overlying Shawozi Fm dolomite

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 contains stromatoporoid Clathrodictym sp., Anoxtylostroma sp., Amphypora sp., Paramphipora sp.; and coral Pseudozaphrentis tenella-Longmenshanophylloides symmetrica Assemblage Zone and Extranella multiseptata-Tuqiaoziphyllum longiseptatum Assemblage Zone.


Age 

Late Devonian

Age Span: 
S

    Beginning stage: 
Frasnian

    Fraction up in beginning stage: 
0.3

    Beginning date (Ma): 
376.56

    Ending stage: 
Frasnian

    Fraction up in the ending stage: 
0.9

    Ending date (Ma):  
371.88

Depositional setting

Carbonate platform.


Depositional pattern:  


Additional Information


Compiler:  

(Wang Shitao)