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Xilanta Formation

Xilanta Fm


Period: 
Permian

Age Interval: 
P (52), mid-Guadalupian Epoch (mid-Middle Permian)


Province: 
Xizang (Tibet)

Type Locality and Naming

The type section is located on the eastern flank of the Jiangyema area about 100 km to the southeast of the Zhada County, Tibet. It was named by the Tibetan Regional Reconnaissance Party in 1987.


Lithology and Thickness

Limestone. Composed of purple limestone, brecciated limestone and bioclastic limestone, intercalated with two layers of basic volcanic rocks, and with a thickness of over 1373.4 m.


Lithology Pattern: 
Limestone


Relationships and Distribution

Lower contact

Uncertain relationship with the underlying strata (Xiajuripu Fm)

Upper contact

Uncertain relationship. Next younger regional unit is the Jiangyema Fm

Regional extent


GeoJSON

null

Fossils

Yields Fusulinids such as Neoschwagerina, Pseudodoliolina, Chusenella, Verbeekina, Yangchienia, and Eopolydiexodina, etc.


Age 

Kufengian Stage of the Yangsingian Epoch = mid-Guadalupian Epoch (mid-Middle Permian)

Age Span: 

    Beginning stage: 
Roadian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
274.37

    Ending stage: 
Capitanian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
259.55

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wang Yujing