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Yageliemu Formation
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Yageliemu Fm base reconstruction

Yageliemu Fm

Period: 
Cretaceous

Age Interval: 
Early Cretaceous, K1y. (4)


Province: 
Xinjiang

Type Locality and Naming

Kuqa Depression, NW Tarim. The Yageliemu Formation was erected by the 107 Department of Petroleum Administration bureau of Xinjiang (Wang Aimin, 1975), and was first cited publicly by the Compiling Group for the Regional Stratigraphic Chart of Xinjiang Uygur Autonomous Region in 1981. The type locality is situated to the north of the Kapushaliang River northwest of the Baicheng County town, Xinjiang (E81°36′20″, N42°02′40″). Lower formation in Kapushaliang Gr


Lithology and Thickness

The Yageliemu Formation is composed light purple, grayish purple conglomerate and sandstone, with cross bedding; and with a thickness of 122 m.


Lithology Pattern: 
Conglomerate


Relationships and Distribution

Lower contact

The formation is in a disconformable or an unconformable contact with the underlying Kalazha Fm.

Upper contact

The formation contacts conformably with overlying Shushanhe Fm.

Regional extent

It distributed in the Baicheng, Kuqa areas of Xinjiang. It is found to occur only in the northern monoclinal belt seated between the Kezlenur Gully and the Tarake River, with the Kapushaliang River section being the best in its development..


GeoJSON

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Fossils

It yields ostracods (as represented by Darwinula tubiformis) and fish fossils.


Age 

Shown as mid-Berriasian to late Valanginian by Dangpeng Xi, Xiaoqiao Wan, et al. (2019; Integrated Stratigraphy and TimeScale of China)

Age Span: 

    Beginning stage: 
Berriasian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
140.40

    Ending stage: 
Valanginian

    Fraction up in the ending stage: 
0.75

    Ending date (Ma):  
133.88

Depositional setting

The formation is suggested as fluvial deposits with a great change in its lithology.


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao; with some details from an entry in the Jurassic Lexicon draft (because of its uncertain age)