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Selong Gr

Selong Gr


Period: 
Permian

Age Interval: 
P2-3 (54a), Kungurian Stage (late Cisuralian Epoch) through Lopingian Epoch [late Permian]


Province: 
Xizang (Tibet)

Type Locality and Naming

The type section is located in the West Hills of the Selong Village to the north of the Shisha Pangma Peak in the Nyalam (Nielamu) County, Tibet. It was named by the Shisha-Pangma Pk.-Scientific Investigation Team in 1964, and was issued publicly in 1981.


Lithology and Thickness

Clastics and Limestone. Consists of the upward succession of Qubu Fm, Quburiga Fm, and Baga Fm. The group represents a marine transgression sequence composed of interbeds of littoral coarse- to fine-grained clastic deposits and littoral fine clastic rock-bio-limestone. Within the Selong Gr itself there seems to be a series of important depositional breaks. Total thickness is 400 m.


Lithology Pattern: 
Sandy limestone


Relationships and Distribution

Lower contact

Conformable contact with the underlying Jilong Fm

Upper contact

Disconformable contact with the overlying Tulong Fm of the Early Triassic Epoch

Regional extent

Distributed in the Dingri, Dingjie, Jilong and Nielamu areas of the Himalayan Stratigraphic Region.


GeoJSON

null

Fossils

Qubu Fm in its lower part yields the Glossopteris flora.

Lower layer of the Quburiga Fm in its upper part yields ammonoids represented by Uraloceras, the middle and upper parts of the formation yield brachiopods represented by the Taeniothaerus assemblage and the Chonetella nasuta assemblage.

Baga Fm in its top part yields conodonts Clarkina aff. Changxingensis, etc., which might probably belong to the Changhsingian Stage (but dashed as Wuchiapingian on Permian lexicon chart column 54).


Age 

Yangsingian Epoch, including probably a part of the Changhsingian Stage in age => Kungurian Stage (late Cisuralian Epoch) through Lopingian Epoch [late Permian]; but with major internal breaks.

Age Span: 

    Beginning stage: 
Kungurian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
283.30

    Ending stage: 
Wuchiapingian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
254.24

Depositional setting

It is interpreted as a marine transgression sequence.


Depositional pattern:  


Additional Information


Compiler:  

Wang Yujing