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Chaqiela Formation
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Chaqiela Fm base reconstruction

Chaqiela Fm

Period: 
Cretaceous

Age Interval: 
Albian, Early Cretaceous, (12b) K1cq


Province: 
Xizang (Tibet)

Type Locality and Naming

Himalayan South Belt. The Chaqiela Formation was erected by Wang Yigang, Sun Dongli and He Guoxiong in 1989. The section for the designation is just on the east side of the Chaqiela hill 4 km northwest of the Jilu village of the Gamba County, Xizang (Tibet).


Lithology and Thickness

Lower part of the present formation is represented by yellow green clayey shale with thin-bedded microcrystalline limestone. Middle part is black gray thin-bedded calcareous siltstone and clayey shale. Upper part is yellow gray moderately thick-bedded silty limestone interbedded with siltstone. The formation is over 180 m thick.


Lithology Pattern: 
Claystone


Relationships and Distribution

Lower contact

Its base contacts conformably with the dark shale interbedded with gray marl at the top of the Gambadongshan Fm.

Upper contact

It underlies conformably under the Lengqinggre Fm.

Regional extent


GeoJSON

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Fossils

The formation yields foraminifera such as Globigerinelloides eaglefordensis, G. benionensis, G. algeriana, Hedbergella planispira, H.trocoidea, Tricinella roberti, Gyroidina exceria, G.tendami, Gyroidinoides, primitive, G. brotzeni rumanus, Lenticulina warregoensis, etc.; and Ammonites such as Mortoniceras sp., Anisoceras sp., etc. in the Gamba area.


Age 

The fossils indicate an Albian age.

Age Span: 

    Beginning stage: 
Albian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
113.20

    Ending stage: 
Albian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
100.50

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao