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Lianmuqin Formation
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Lianmuqin Fm base reconstruction

Lianmuqin Fm

Period: 
Cretaceous

Age Interval: 
Early Cretaceous, K1lm, (1, 2)


Province: 
Xinjiang

Type Locality and Naming

Junggar Basin, Turpan Basin. Xia Gongjun erected the Lianmuqin bed in 1956. The section for the designation is in Lianmuqin of the Turpan basin of Xinjiang. The reference section is in Ziniquanzi of the Shawan County, Xinjiang.


Lithology and Thickness

The Lianmuqin Formation is represented by gray green, yellow green, purple brown and purple red sandy mudstone and clayey siltstone interbedded with mudstone. It is 359.5 m thick.


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

Its base marked by dark purple and brown red sandy mudstone is distinguished from gray green and gray yellow sandy mudstone of the underlying Shengjinkou Fm and shows a conformable contact with the latter.

Upper contact

Its top marked by brown red sandy mudstone and clayey siltstone and sandstone is distinguished from the overlying Donggou Fm (Junngar Basin) or Kumutake Fm (Turpan Basin) and shows a disconformable contact with the latter.

Regional extent

The present formation mainly occurs in Shawan and Manas on the south margin of Karamay and Urho on the northwest margin of the Junggar basin of Xinjiang, and is also exposed in the Turpan-Hami basins. It is persistent both in lithology and facies. In the Huoyanshan area, it is mainly represented by brown red lacustrine sandy mudstone intercalated with gray green and blue gray sandstone and mudstone bands, with gypsum veins. Its top shows a disconformable contact with the overlying Kumutake Formation. It varies considerably in thickness, from scores of meters to more than 300 m. On the south margin of the Junggar basin, it increases in thickness from west to east, and is only 22 m in Tuositai and 509 m in Toutunhe eastward.


GeoJSON

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Fossils

The formation yields bivalves Nakamuranaia elogata, N. manasensis, Sphaerium jeholense, S. inflatum, Inversidens wuerthoensis; in the Ailike lake south of Urho Reptilia Dsungaripterus weii, Noripterus complicidens, Edentosuchus tienshanensis, Tugulusaurus faciles, Phaedrolasaurus ilikensis, Kelmayisaurus petrolicus, Wuerhosaurus homheni, Sinemys wuerhoensis, Asiatosaurus mongoliensis; in Delunshan also bears Psittacosaurus sp., Coelurosauridae sp., Megalosauridae sp.; in Shengjinkou ostracods Cypridea koskulensis, C. unicostata, C. trita, C. simplex, C. oneruza, C. tuguluensis, Rhinocypridea cirrita, R. echinata, Clinosypris scolia; Charophytes represented by the Wangichara tanshanensis-Piriformachara gumudiensis assemblage; and sporopollen grains represented by the Cicatricosisporites-Interulobites-Tricolpites assemblage.


Age 

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

Age Span: 

    Beginning stage: 
Aptian

    Fraction up in beginning stage: 
0.25

    Beginning date (Ma): 
119.35

    Ending stage: 
Albian

    Fraction up in the ending stage: 
0.75

    Ending date (Ma):  
103.68

Depositional setting

It is of lacustrine deposition.


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao