Kalpintag Fm
Type Locality and Naming
The Formation was named by the 13th Team of Ministry of Geology in 1955 and published by Zhang Ridong et al in 1959. The type section is approximately 10 km northwest of the Kalpin County in the Xinjiang) Uygur Zizhiqu. The reference section is at Dawuan'gou, 20 km northwest of Yingan Village, Kalpin County.
Synonym: (柯坪塔格组); Kalpintake Fm, Kelpintag Fm, Kepingtage Fm
Lithology and Thickness
The formation, 353 m in thickness, is dominated by interbeds of yellow green, gray green and purplish fine-grained sandstone with quartzose siltstone, mudstone and silty mudstone, with yellow gray conglomerate at the base; the muddy siltstone may contain muddy gravels or fine cross-beds (Figure).
[Figure the lithology of, and the contact relation between Kalpintag and Tataertag formations at Tierekeawati Section, Kalpin, Xinjiang (Photography by Wang Guangxu)]
 Fm outcrops.jpg)
Relationships and Distribution
Lower contact
The Kalpintag Fm, 353 m in thickness, is disconformably underlain by the Tierekeawati Fm of late Ordovician.
Upper contact
It is conformably overlain by the Tataertag Fm.
Regional extent
In the area of Kalpin and at Halchak Mt.-Altemeishibulak, north of Lop Nur. at Xiaohaizi Reservoir in Bachu (Maralwexi) County, it is changed into purplish red color and is 107 m in thickness. At the type section area in Kalpin, it is 445 m thick. Based on geophysical data, the formation is very widely distributed underground.
GeoJSON
Fossils
It is rich in fossils in the upper part, yielding the graptolites Normalograptus tangshanensis, N. tamariscus linearis, N. cf. tamariscus, Climacograptus nanjiangensis, C. angustus, C. minutus, Petalolithus ataum; bivalves Nuculites kalpinensis, Praectenodonta kalpiensis, Palaeoneilo sp.; gastropods Bucanopsis sp., Planitrochus sp., Eatomaria sp.；trilobites Leonaspis sp., Encrinuroides sp.; chitinozoa Conochitina sp., etc.
Age
Depositional setting
It belongs to neritic-littoral facies according to the fossils and depositional characteristics.
Additional Information