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Jiangjiawan Formation
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Jiangjiawan Fm base reconstruction

Jiangjiawan Fm

Period: 
Carboniferous

Age Interval: 
C21 (35b), Visean (middle Early Carboniferous)


Province: 
Yunnan

Type Locality and Naming

The type section lies at Qingshuigou, Jinji Village, on the northeast side of Banqiao Town, Baoshan, Yunnan. It was named by Wang Xiangdong et al. in 1993.


Lithology and Thickness

Marl and Limestone. Lower part consists of gray thin-bedded marl and dark-gray moderately thick-bedded micrite bioclastic limestone, containing diagenetic siderite concretions. The Middle and Upper parts are interbeds of micrite bioclastic limestone and marl-bearing micro-grained quartzose sandstone. About 120 m thick.


Lithology Pattern: 
Limestone


Relationships and Distribution

Lower contact

Conformable contact with the underlying Qingshuigou Fm

Upper contact

Disconformable contact with the overlying Jingjiazhai Fm (not in Carboniferous or Permian Lexicon)

Regional extent

Distributed in the northeastern part of Baoshan Mt.


GeoJSON

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Fossils

In the bioclastic limestone and marl of this formation are contained large amounts of fossils, including small-sized solitary Corals Pentaphyllum, Ufimia, Cyathaxonia, Commutia and Sychnoelasma; Brachiopods Pugilis, Eochoristites, Unispirifer, Fusella, Plicochonetes and Scutepustula; Conodonts Gnathodus pseudosemiglaber, G. semiglaber, G. texanus, etc., as well as gastropods, trilobites, crinoids, etc., being of the Visean Age.


Age 

Visean (middle Early Carboniferous)

Age Span: 

    Beginning stage: 
Visean

    Fraction up in beginning stage: 
0.2

    Beginning date (Ma): 
343.45

    Ending stage: 
Visean

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
330.34

Depositional setting

It is interpreted as fluvial-deltaic and littoral-neritic limestones and clastics.


Depositional pattern:  


Additional Information


Compiler:  

Wang Xiangdong