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Guiya Formation
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Guiya Fm base reconstruction

Guiya Fm

Period: 
Cretaceous

Age Interval: 
Early Cretaceous, (7b) K1gy


Province: 
Xizang (Tibet)

Type Locality and Naming

The Guiya Formation was designated by Wang Naiwen in 1983. The section for the designation is at Guiya of the Baingoin County, Xizang. The reference section is at Boboyala (Boboyagla) of the Baingoin County of Xizang.


Lithology and Thickness

The Guiya Formation is represented by gray and gray brown, yellow brown and slightly red moderately thick-bedded-massive limestone, occasionally with siltstone. It is 200 m thick.


Lithology Pattern: 
Limestone


Relationships and Distribution

Lower contact

Its base lies conformably on the underlying Xiaqiongcuo Fm (Xiaqiogco Fm) of late Jurassic through earliest Cretaceous.

Upper contact

It is in disconformable contact with the overlying Boboyagia Fm.

Regional extent

The present formation mainly occurs in the Xiaqiongcuo, Guiya and Boboyala areas of the Baingoin County. It is persistent in lithology.


GeoJSON

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Fossils

The formation bears ammonites Partshiceras sp., Foraminifera Orbitolina bulgarica, bivalve Requienia sp., gastropods Pleurotomaria sp. and Adiozoptys sp., Echinoidea Pygaulus sp. and Cidaris sp., brachiopods, etc.


Age 

Not given; but a strat column had suggested it spanned most of the Early Cretaceous.

Age Span: 

    Beginning stage: 
Hauterivian

    Fraction up in beginning stage: 
0.75

    Beginning date (Ma): 
128.03

    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