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Shawozi Formation
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Shawozi Fm base reconstruction

Shawozi Fm

Period: 
Devonian

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


Province: 
Sichuan

Type Locality and Naming

The type section is located near Shawozi Village, Ganxi Town, Beichuan County of Sichuan Province. It was named by Yoh Senxun in 1956.


Lithology and Thickness

Dolomite. The Shawozi Formation, 35 m thick, is composed of grayish-white massive dolomite intercalated with clayey limestone bearing stromatoporoids and algae-laminated limestone.


Lithology Pattern: 
Dolomite


Relationships and Distribution

Lower contact

Conformable contact with the overlying oolitic-limestone of the Maoba Fm.

Upper contact

Conformable contact with the underlying Xiaolingpo Fm reefal limestone

Regional extent

The Formation is widely distributed in Longmenshan Mt. area with a persistent lithology, but regionally it has a maximum thickness of 550 m.


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

The fossils are rare, and occasionally include Yarphyllum elegantum, T. zhongguoensis, T. stroseptatum, ongmenshanophylloides sichuanensis.


Age 

Late Frasnian-early Famennian (early Late Devonian)

Age Span: 
S

    Beginning stage: 
Frasnian

    Fraction up in beginning stage: 
0.9

    Beginning date (Ma): 
371.88

    Ending stage: 
Famennian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
365.20

Depositional setting

Carbonate platform.


Depositional pattern:  


Additional Information


Compiler:  

(Wang Shitao)