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Gambacunkou Formation
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Gambacunkou Fm base reconstruction

Gambacunkou Fm

Period: 
Cretaceous

Age Interval: 
Late Cretaceous, (12b) K2gc


Province: 
Xizang (Tibet)

Type Locality and Naming

Himalayan South Belt. The Gambacunkou Formation wide distributed in the Gamba and Tingri area, southern Tibet. The Gambacunkou Formation was named by Wang Yigang et al. (1980). Wan Xiaoqiao (1985) and Wan Xiaoqiao et al. (2000) subdivided the lower part as the Lengqingre Fm, and referred the Gambacunkou Formation to the middle and upper part. The new definition of the Gambacunkou Formation includes the Lower member (or XiawuchuboMember Fm) and the Upper member (or JiubaoMember Fm).

[Figure: Type section of Gambacunkou Formation (lower) in Gamba of southern Tibet]


Lithology and Thickness

The Gambacunkou Formation is a group of yellowish green shale and thin-bedded limestone. The Lower (XiawuchuboMember Fm) member is composed mostly of yellowish green shale intercalated with thin bedded marls, and the Upper (JiubaoMember Fm) member consists of inter-beddings of yellowish grey shale and thin bedded limestones. The formation is 200~209 m in thickness

[Figure: Gambacunkou Formation (lower) in Gongza section, Tingri of southern Tibet]


Lithology Pattern: 
Shallow-marine marl


Relationships and Distribution

Lower contact

It overlies conformably on the Lengqingre Fm.

Upper contact

It underlies conformably under the Zongshan Fm.

Regional extent

The Gambacunkou Formation is distributed in the Gamba and Tingri area, southern Tibet.


GeoJSON

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Fossils

The Gambacunkou Formation contains abundant fossils. It yields foraminifera, ammonites, bivalves, and sea urchins. Planktonic foraminifera are dominated by Maiginotruncana schneegansi, M. coronata, M. sigali, Hedbergella planispira, H. delrioensis, H. holmdelensis and others.


Age 

The formation is lower Turonian to Coniacian in age

Age Span: 

    Beginning stage: 
Turonian

    Fraction up in beginning stage: 
0.1

    Beginning date (Ma): 
93.45

    Ending stage: 
Campanian

    Fraction up in the ending stage: 
0.25

    Ending date (Ma):  
80.78

Depositional setting

It is of continental shelf facies.


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao