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Baiyashan Formation
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Baiyashan Fm base reconstruction

Baiyashan Fm

Period: 
Cretaceous

Age Interval: 
Aptian-Albian, Early Cretaceous, K1by, (37)


Province: 
Fujian

Type Locality and Naming

Western Fujian. In 1972 the Fujian Regional Geological Survey Team erected the Baiyashan Group of which the type section is located at Baiyashan to the east of Julan Village of Dabu Township of the Taining County, Fujian Province. It was renamed the Baiyashan Formation during the stratigraphic sorting of Fujian.


Lithology and Thickness

The Baiyashan Formation is represented by a set of purple red volcanic-sedimentary rock series and can be roughly divided into two parts. Lower part is represented by purple red conglomerate and sandstone with siltstone, with a thickness ranging from several to more than 200 m. Upper part is mostly dominated by purple red acidic lava, with a gradual increase in the amount of alkaline trachyte from southwest to northeast of Ninghua, Taining, Jianning and Pucheng, with thickness decreased (1839.5-1206-200 m) accordingly.


Lithology Pattern: 
Lava


Relationships and Distribution

Lower contact

The Baiyashan Formation of the acidic rock assemblage is overlying the Bantou Fm or JishanFujian Fm.

Upper contact

Underlying the Junkou Fm in the Ninghua area

Regional extent


GeoJSON

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Fossils

None listed


Age 


Age Span: 

    Beginning stage: 
Aptian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
117.30

    Ending stage: 
Albian

    Fraction up in the ending stage: 
0.7

    Ending date (Ma):  
104.31

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao