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Xiajuripu Formation
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Xiajuripu Fm base reconstruction

Xiajuripu Fm

Period: 
Permian

Age Interval: 
P (52), Kungurian Stage (late Cisuralian Epoch; late Early Permian)


Province: 
Xizang (Tibet)

Type Locality and Naming

The type section is located in the Juripu area about 30 km to the northeast of the Zhongba County, Tibet. It was named by the Regional Geological Reconnaissance Party under the Geological Bureau of Tibet in 1983.


Lithology and Thickness

Limestone and Clastics. Composed of variegated limestone, slate, bioclastic, limestone and quartz-sandstone, with a thickness of 935 m.


Lithology Pattern: 
Clayey limestone


Relationships and Distribution

Lower contact

Disconformable or locally in an unconformable contact with the underlying Carboniferous slate. [Permian lexicon (2017) stratigraphic column 52 indicates next older is Qumenxiala Fm of Devonian]

Upper contact

Uncertain relationship. Next younger regional unit is the Xilanta Fm

Regional extent

Distributed in the area of the Zhongba County.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[84.5,29.82],[85.52,29.37],[86.01,29.12],[86.46,28.79],[86.1,28.83],[85.45,28.82],[85.06,28.76],[84.85,28.78],[84.62,28.83],[84.57,28.87],[84.41,28.97],[84.37,29.04],[84.37,29.09],[84.23,29.33],[84.18,29.38],[84.1,29.48],[84.05,29.51],[83.99,29.51],[83.91,29.51],[83.84,29.51],[83.75,29.48],[83.65,29.42],[83.58,29.41],[83.53,29.42],[83.5,29.45],[83.44,29.59],[82.95,29.77],[82.69,29.9],[82.43,30.07],[82.3,30.15],[82.27,30.25],[82.05,30.48],[81.9,30.69],[82.21,30.62],[83.3,30.4],[83.74,30.23],[84.05,30.04],[84.5,29.82]]]]}}

Fossils

Yields abundant biologic fossils among which the Fusulinids belongs to the Parafusulina fauna; the Brachiopods represent the Taeniothaerus assemblage; and the Corals represent the Lytvolasma fauna, whose features are similar to those of the faunas from the Quburiga Fm in the Himalayan stratigraphic region.


Age 

early stage of the Yangsingian Epoch = Kungurian Stage (late Cisuralian Epoch)

Age Span: 

    Beginning stage: 
Kungurian

    Fraction up in beginning stage: 
0.4

    Beginning date (Ma): 
279.73

    Ending stage: 
Kungurian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
274.37

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wang Yujing

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