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Jingzhushan Formation
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Jingzhushan Fm base reconstruction

Jingzhushan Fm

Period: 
Cretaceous

Age Interval: 
Late Cretaceous, (7a) K2jzs


Province: 
Xizang (Tibet)

Type Locality and Naming

North Lhasa Block – Sillin Co Basin. The No.4 Geological Team of Xizang erected the Jingzhushan Formation in 1973. The section for the designation is in Duoba of the Baingoin (Bange) County of Xizang (Tibet).


Lithology and Thickness

It is a group of greyish purple to purplish red conglomerates and sandstones with freshwater limestones or Orbitolina-bearing limestones in the Lower part. Upper part is dominated by conglomerates yielding rare fossils. The thickness of formation is 461 to 2500 m in the Bangoin (Bange) County.


Lithology Pattern: 
Conglomerate


Relationships and Distribution

Lower contact

The formation overlies unconformably the Langshan Fm.

Upper contact

Regional extent

The formation is distributed along Ge’gyai to Baingoin belt.


GeoJSON

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Fossils

The lower part of formation includes Bivalves Trigonioides (T.) sinensis Gu et Ma, T. (Diversitrigonioides) xizangensis Gu., and Foraminifera Orbitolina concava Lam., indicating a Cenomanian age. But the top age is obscure.


Age 


Age Span: 

    Beginning stage: 
Cenomanian

    Fraction up in beginning stage: 
0.7

    Beginning date (Ma): 
95.88

    Ending stage: 
Campanian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
72.17

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao