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Bolinxiala Formation
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Bolinxiala Fm base reconstruction

Bolinxiala Fm

Period: 
Cretaceous

Age Interval: 
Late Cretaceous, (12a) K2bx


Province: 
Xizang (Tibet)

Type Locality and Naming

Himalayan South Belt near Kashmir. The Bolinxiala Formation was erected by Liang Dingyi et al in 1991. Its type section for the designation is in Bolinxiala-Chagagou of the Zanda County of westernmost Xizang (79°25′E; 31°20′N).


Lithology and Thickness

This formation is represented by light gray massive thick-bedded limestone with sandy limestone and yellow gray thin-bedded clayey limestone, with the top unknown. The Bolinxiala Formation is more than 233 m thick.


Lithology Pattern: 
Limestone


Relationships and Distribution

Lower contact

The basal part is built up by light gray massive limestone and contacts conformably with the purple gray moderately thick-bedded fine-grained graywacke of the underlying Gajie Fm (= Gagyai Fm)

Upper contact

Its top is not obvious in the afore-mentioned area.

Regional extent

The present formation is distributed around Bolinxiala and Gajie. It is quite persistent in lithology and varies greatly in thickness, from 180 m to 484 m.


GeoJSON

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Fossils

In the Bolin area it yields Foraminifera Globotrumcana stuartiformis, G. cf. ventricosa, G.liuneiana tricarinata, G.bulloides, etc.; bivalves Liostrea sp., Buchia sp.; Echinoidea, etc.


Age 

Shown as ca. Turonian through Maastrichian (dotted) on China Lexicon strat chart.

Age Span: 

    Beginning stage: 
Turonian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
93.90

    Ending stage: 
Maastrichtian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
66.04

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao