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Permian
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Darequanzi Formation

Darequanzi Fm

Period: 
Permian

Age Interval: 
P (8a), early Middle Permian


Province: 
Xinjiang

Type Locality and Naming

The type section is located at Aqikebulak of Shanshan County, Xinjiang Uygur Autonomous Region. It was named by the 2nd Regional Geological Survey Expedition under the Xinjiang Geological Bureau in 1965.


Lithology and Thickness

Clastics. Composed mainly of interbeds of grey-green and purplish red polymineralic sandstone, sandy conglomerate and siltstone, intercalated with limestone. Thickness of 376-800 m.


Lithology Pattern: 
Coarse-grained sandstone


Relationships and Distribution

Lower contact

Conformable contact with the underlying Aqikebulak Fm.

Upper contact

Unknown; no top part of the formation having been exposed. Chart indicates next younger preserved unit is Jurassic

Regional extent

Distributed in the center of the Aqikebulak Basin to the south of the Aiding Lake.


GeoJSON

null

Fossils

Brachiopods such as Oldhamina sp.; and Bivalves such as Edmondia suvata, Pseudomonotis sp., and Allosisma aff. granasu.


Age 

Assigned to early-Middle Permian.

Age Span: 

    Beginning stage: 
Kungurian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
283.30

    Ending stage: 
Kungurian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
278.84

Depositional setting

It seems to be littoral shallow-sea facies or waterway deposits.


Depositional pattern:  


Additional Information


Compiler:  

Hou Jingpeng