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Boboyagla Formation
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Boboyagla Fm base reconstruction

Boboyagla Fm

Period: 
Cretaceous

Age Interval: 
Late Cretaceous, (7b) K2bb


Province: 
Xizang (Tibet)

Type Locality and Naming

The Boboyagla Formation was established by Wang Naiwen in 1983. The type section for its designation is just in Guiya of Baingoin county, Xizang (89°36′E; 31°45′N). Its reference section is in Boboyagla (Boboyala) of the Baingoin County of Xizang.

Synonym: Baboyala Fm, Popoyala Fm


Lithology and Thickness

The Boboyagla Formation is represented by gray, brownish yellow and red medium-bedded limestone and marl interbedded with grayish yellow and yellowish green medium and fine-grained sandstone and mudstone and red and green siliceous rocks. It is 400 m thick.


Lithology Pattern: 
Sandy limestone


Relationships and Distribution

Lower contact

It is in disconformable contact with the underlying Guiya Fm at the base.

Upper contact

Its is in conformable contact with the overlying Pintaboluo Fm.

Regional extent

This formation is generally distributed in the Guiya and Boboyagla (Boboyala) area of Baingoin County of Xizang.


GeoJSON

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Fossils

In the Guiya and Boboyagla area, it yields bivalves Isognomon cf. orientalis, Plicatula sp., Proviniella sp., Nucula sp., Lima sp., Lopha sp., Gervillia sp., Insocardia sp., etc.; big gastropods Nerinea sp., Cerithium sp., Aplocus sp.; Radiolaria, Echinoidea, corals, etc.


Age 


Age Span: 

    Beginning stage: 
Cenomanian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
100.50

    Ending stage: 
Coniacian

    Fraction up in the ending stage: 
0.25

    Ending date (Ma):  
88.47

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao