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Guanyinmiao Formation
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Guanyinmiao Fm base reconstruction

Guanyinmiao Fm

Period: 
Devonian

Age Interval: 
D1 (70), Early Devonian


Province: 
Sichuan

Type Locality and Naming

The Guanyinmiao Fm is the upper-middle formation in the Pingyipu Gr. The type section is located at the roadside near Guanyinmiao of Ganxi Township, Beichuan County, Sichuan Province. It was named by Hou Hongfei and Wan Zhengquan in 1988.


Lithology and Thickness

Sandstone. It is dominated by gray to dark-gray medium- to fine-grained quartz sandstone intercalated with greywacke.


Lithology Pattern: 
Sandstone


Relationships and Distribution

Lower contact

It has conformable contact with the underlying Muerchang Fm

Upper contact

It has conformable contact with the overlying Guanshanpo Fm

Regional extent

This formation is most developed in Guixi to Ganxi areas of Beichuan where it is 271 m in thickness, but stretching to the southeast limb of Tangwangzhai syncline, it is hard to recognize because of the reduced thickness.


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 Eurypterida, plant fragments and spores.


Age 

Early Devonian

Age Span: 
S

    Beginning stage: 
Lochkovian

    Fraction up in beginning stage: 
0.7

    Beginning date (Ma): 
414.38

    Ending stage: 
Lochkovian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
412.40

Depositional setting

Clastic shelf facies.


Depositional pattern:  


Additional Information


Compiler:  

(Wang Shitao)