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Quburiga Formation
Click to display on map of the Ancient World at:
Quburiga Fm base reconstruction

Quburiga Fm

Period: 
Permian

Age Interval: 
P2 (54a), Kungurian Stage (late Cisuralian Epoch) through Guadalupian Epoch [latest-Early through Middle Permian]


Province: 
Xizang (Tibet)

Type Locality and Naming

The type section is located in the West Hills of the Qubu region, Dingri County, Tibet. It was named by Yin Jixiang and Guo Shizeng in 1976.


Lithology and Thickness

Limestone and sandy shale. Composed of grey sandy shale and siltstone, intercalated with bioclastic limestone. It is divisible into three members: Lower member being composed largely of sandstone and siltstone, with a thickness of 40 m. Middle member representing interbeds of limestone and sandy shale, yielding abundant brachiopod fossils, with a thickness of 232 m. Upper member consisting chiefly of grey-black shale, with a thickness of 86 m. The total thickness is about 375.1 m.


Lithology Pattern: 
Clayey limestone


Relationships and Distribution

Lower contact

Conformable contact with the underlying Qubu Fm

Upper contact

Disconformable contact with the overlying Baga Fm.

Regional extent

Distributed very extensively, and is found to occur in the West Hills of the Qubu Region, Dingri County, the Sure Mt., Gumu Trench, Xishan Mt. of the Selong Region of the Nyalam County, as well as in the vicinity of the Naxing County and in the area Gongda Region, Jilong County, and in the vicinity of Sarkujian Region of the Dingjie County.


GeoJSON

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Fossils

It yields abundant marine animal fossils, including Brachiopods represented by the Taeniothaerus assemblage, the Calliomarginatia assemblage and the Chonetella assemblage; the Lytvolasma fauna of Corals, and Ammonoids represented by Uraloceras xizangensis.


Age 

Within Yangsingian Epoch = within interval of Kungurian Stage (late Cisuralian Epoch) through Guadalupian Epoch [latest-Early through Middle Permian]

Age Span: 

    Beginning stage: 
Kungurian

    Fraction up in beginning stage: 
0.4

    Beginning date (Ma): 
279.73

    Ending stage: 
Wordian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
264.34

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wang Yujing

GeoJSON estimate by Longgang Ye and Yuyin Li (Chengdu Univ. Tech. students)