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Junkou Formation
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Junkou Fm base reconstruction

Junkou Fm

Period: 
Cretaceous

Age Interval: 
Early Cretaceous, K1jk, (37)


Province: 
Fujian

Type Locality and Naming

Western Fujian. The Junkou Formation was established by the Fujian Petroleum Geological Team in 1979. The type locality for the designation is in Junkou township south of the Jianning County of Fujian. The section for the designation is around Yanchikeng of the Ninghua County of Fujian.


Lithology and Thickness

The Junkou Formation is represented by a set of microclastic sediments mainly comprising light gray, gray green and gray black siltstone and mudstone. It is 195.5 m thick in the Hekou basin of Ninghua, 395.9 m in the Shaxian basin, and 567.8-573.5 m in Yanchikeng. It is 578.5 m thick.


Lithology Pattern: 
Siltstone


Relationships and Distribution

Lower contact

Its base built up by sandy conglomerate and conglomerate is in disconformable contact with the Baiyashan Fm.

Upper contact

Its top is bounded by the appearance of purple red siltstone of the Shaxian Fm, showing a conformable contact with the latter

Regional extent

The formation mainly occurs in Shaxian, and Junkou of Jianning and Hekou of Ninghua. It is basically persistent in lithology and varies considerably in thickness..


GeoJSON

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Fossils

The formation yields floras Pseudofrenelopsis parceramosa, Brachyphyllum obesum.


Age 


Age Span: 

    Beginning stage: 
Albian

    Fraction up in beginning stage: 
0.7

    Beginning date (Ma): 
104.31

    Ending stage: 
Cenomanian

    Fraction up in the ending stage: 
0.4

    Ending date (Ma):  
97.86

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao