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Ziniquanzi Formation

Ziniquanzi Fm


Period: 
Paleogene

Age Interval: 
Early Paleocene to Middle Eocene, (1b)


Province: 
Xinjiang

Type Locality and Naming

Junggar Basin. The naming section is located near Ziniquanzi, Manas County on the southern margin of the Junggar basin, Xinjiang. Named by the Compilation Team of the “Regional Stratigraphic Table of the Xinjiang Uygur Autonomous Region” in 1981.


Lithology and Thickness

The boundary between its base and the Cretaceous Donggou Fm is marked by a bed of calcareous conglomerate or pebbly limestone. Lower part consists of alternating beds of red mudstone, sandstone and conglomerate. Middle part is red, sandy mudstone with green conglomerate, marlstone and calcareous concretions. Upper part is red mudstone alternating with sandstone and siltstone, intercalated with conglomerate lenses. The total thickness is 461 m. This formation is also called the red bed. The upper part is distinguished from the Anjihaihe Formation by purple or brownish purple or grayish green mudstone and siltstone.


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

It is in conformable contact with the underlying Late Cretaceous Donggou Fm.

Upper contact

It is in conformable contact with the overlying Eocene Anjihaihe Fm.

Regional extent

It is distributed from the Toutun River to Tuotuo River and best developed from the Changji River to Manas River, with a thickness of 854 m. West of Ziniquanzi, the formation becomes thin and fine in grain size, represented by brown sandy mudstone, with a thickness of 15–78 m. In the east the formation becomes thick and coarse in grain size, marked by red and reddish brown sandy mudstone and grayish red or grayish brown conglomerate and sandstone. West of Ulan Bulak, it directly covers the Tugulu Group or metamorphic rocks.


GeoJSON

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Fossils

The fossils contained are the ostracods Limnocythere, Eucypris, etc.


Age 

Implied as beginning in upper Campanian by Dangpeng Xi, Xiaoqiao Wan, et al. (2019; Integrated Stratigraphy and TimeScale of China) and, if coeval with Yixibaila Fm (Ulunguhe Fm) entry in this Lexicon, then extending through early-Early Eocene (mid-Ypresian).

Age Span: 

    Beginning stage: 
Campanian

    Fraction up in beginning stage: 
0.75

    Beginning date (Ma): 
75.04

    Ending stage: 
Ypresian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
52.04

Depositional setting

Lithologically the formation belongs to fluvio-lacustrine clastic rocks.


Depositional pattern:  


Additional Information


Compiler:  

Tao Deng, Yuanqing Wang, Qian Li, et al.