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Maoba Formation
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Maoba Fm base reconstruction

Maoba Fm

Period: 
Devonian

Age Interval: 
D32 (70), Middle and Late Famennian (Late Devonian)


Province: 
Sichuan

Type Locality and Naming

The type section is located nearby Maoba Village, about 4 km northwest of Yanmenba in Jiangyou City, Sichuan Province. The representative section is nearby Shawozi of Jiangyou. It was named by Yue Senxun in 1965.


Lithology and Thickness

Limestone. It is dominated by sparry nodular oolitic limestone, intercalated with bioclastic limestone and algal-laminated limestone, 172.74 m thick.


Lithology Pattern: 
Oolitic limestone


Relationships and Distribution

Lower contact

The formation is in conformable contact with the underlying dolomite of the Shawozi Fm.

Upper contact

It is in conformable contact with the overlying limestone of the Changtanzi 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

The fossils are poor, only brachiopods Cyrtospirifer and conodont Polygnathus obliquicostatus have been reported in the upper part.


Age 

Middle and Late Famennian (Late Devonian)

Age Span: 
S

    Beginning stage: 
Famennian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
365.20

    Ending stage: 
Famennian

    Fraction up in the ending stage: 
0.75

    Ending date (Ma):  
362.25

Depositional setting

It is interpreted as a tidal flat and oolitic beach facies.


Depositional pattern:  


Additional Information


Compiler:  

(Xian Siyuan)