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Maludong Formation

Maludong Fm

Period: 
Devonian

Age Interval: 
D13-D21 (30), late Early Devonian - early Middle Devonian


Province: 
Yunnan

Type Locality and Naming

The type section is located at Maludong of Jinping County, Yunnan Province.

It was named by No 6 Branch Team of Yunnan No 2 Team of regional Geological Survey in 1972 (unpublished), and was formally published by Yunnan Compiling Group for Regional Stratigraphical Scale in 1978.


Lithology and Thickness

It is a set of carbonate rock, mainly composed of dark-gray to grayish-black micrite and dolomitic limestone intercalated with marl, amounting 1808 m in thickness.


Lithology Pattern: 
Dolomitic limestone


Relationships and Distribution

Lower contact

It has disconformable contact to the underlying dolomite of the Middle Silurian.

Upper contact

It is overlain by grayish-black chert interbedded with siliceous shale of the Songjiazhai Fm.

Regional extent

It is distributed at Maludong, Songjiazhai, Luogetang, Yilihe, etc. in Jinping County, Yunnan Province.


GeoJSON

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Fossils

The formation yields abundant coral Favosites, Dictyofavosites, Tryplasma, Thamnopora and Stromatopora.


Age 

late Early Devonian to early Middle Devonian

Age Span: 

    Beginning stage: 
Pragian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
412.40

    Ending stage: 
Emsian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
394.30

Depositional setting

It is interpreted as a restricted platform and lagoon facies.


Depositional pattern:  


Additional Information


Compiler:  

(Xian Siyuan)