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Shengjinkou Formation
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Shengjinkou Fm base reconstruction

Shengjinkou Fm

Period: 
Cretaceous

Age Interval: 
Early Cretaceous, K1sj, (1, 2)


Province: 
Xinjiang

Type Locality and Naming

Junggar Basin, Turpan Basin. The Shenjinkou Formation was erected by Xia Gongjun (1956) in the Shenjinkou area of the Turpan Basin. It was named by the No. 109 Party under the Division of Explorations of the Petroleum Administration of Yumen as the Shengjinkou Horizon in 1958. The naming locality is situated at Shengjinkou area 20 km east of Tulufan City, Xinjiang, with the reference section in the Lianmuxin area about 20 km west of the Shanshan County. [Cret Lexicon entry " The reference section is in Ziniquanzi of the Shawan County."]. Upper (second) formation in Tugulu Gr.

Synonym: （胜金口组）


Lithology and Thickness

The Shenjinkou Formation is composed mainly by gray and gray green sandstones intercalated with limestone and calcareous sandstone. A layer of grayish green and yellowish green sandy mudstone occurs at the base. The upper part of the particular formation is intercalated with a small amount of purple bands. Siderite and gypsum intercalations were found in the Shenjinkou section of Turpan Basin. The formation is 50-250 m thick in the Junggar Basin, 15-62 m thick in the Turpan Basin. It is remarkable for its greenish Fish clay bed in the Turpan Basin.


Lithology Pattern: 
Sandstone


Relationships and Distribution

Lower contact

The formation contacts conformably with the underlying Hulubihe Fm (Junggar Basin) or Sanshilidadun Fm (Turpan Basin).

Upper contact

The formation contacts conformably with the overlying Lianmuqin Fm.

Regional extent

It distributed in the Junggar, Turpan, Hami basins and Karamay City. The particular formation is distributed in the Tulufan and Junggar Basins, as well as in the East Junggar and West Junggar intermontane basins. The lithology of the formation is more or less consistent from region to region, and with its thickness varying in a range from 20 m to 130 m.


GeoJSON

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Fossils

The formation contains rich fossils of charophytes, ostracods, bivalves, and fish. It yields fish fossils such as Uighuroniscus sinkiangensis, Siyuichthys ornatus and Wukungia huoyanshanensis; conchostraca fossils as represented by Turfanograpta chowmincheni and T. chance, and Ostracoda fossils as represented by Cypridea (C.) koskulensis. In the area of the southern margin of the Junggar Basin the particular formation yields also Charophyta fossils.

.


Age 

Shown as Barremian through lower Aptian by Dangpeng Xi, Xiaoqiao Wan, et al. (2019; Integrated Stratigraphy and TimeScale of China)

Age Span: 

    Beginning stage: 
Barremian

    Fraction up in beginning stage: 
0.1

    Beginning date (Ma): 
125.99

    Ending stage: 
Aptian

    Fraction up in the ending stage: 
0.25

    Ending date (Ma):  
119.35

Depositional setting

It is a group of lacustrine deposits.


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao; with additional details from an entry within Jurassic Lexicon