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Baxigai Formation
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Baxigai Fm base reconstruction

Baxigai Fm

Period: 
Cretaceous

Age Interval: 
Early Cretaceous, K1bx, (4)


Province: 
Xinjiang

Type Locality and Naming

Kuqa Depression, NW Tarim. The 107 Department of Petroleum Administration Bureau of Xinjiang (1975) erected the Baxigai Formation in Kapushaliang section of the Baicheng County, Xinjiang (E81°36′20″, N42°02′40″). Upper formation in Kapushaliang Gr


Lithology and Thickness

The Baxigai Formation is a group of brownish red sandy mudstone intercalated with sandstone beds, locally with intercalations of grayish green sandstone and siltstones.

[Figure: Baxigai Formations in Kuqa River section, Kuqa County, Xinjiang]


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

The formation contacts conformably with the underlying Shushanhe Fm.

Upper contact

The formation contacts unconformably with the above Bashijiqike Fm (with most of Late Cretaceous absent).

Regional extent

It distributed in Kuqa and Baicheng areas, Xinjiang.


GeoJSON

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Fossils

It contains charophyte and ostracod fossils.


Age 

Shown as latest Hauterivian through mid-Barremian by Dangpeng Xi, Xiaoqiao Wan, et al. (2019; Integrated Stratigraphy and TimeScale of China)

Age Span: 

    Beginning stage: 
Hauterivian

    Fraction up in beginning stage: 
0.9

    Beginning date (Ma): 
127.11

    Ending stage: 
Barremian

    Fraction up in the ending stage: 
0.6

    Ending date (Ma):  
123.44

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao