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Wangjiazhai Formation
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Wangjiazhai Fm base reconstruction

Wangjiazhai Fm

Period: 
Permian

Age Interval: 
P3 (78), Changhsingian Stage (late Lopingian Epoch; latest Permian)


Province: 
Guizhou, Yunnan, Sichuan

Type Locality and Naming

The type section is located in the Wangjiazhai area about 20 km to the north of Liupan City, Guizhou Province. It was named by Tian Baolin et al. in 1980.


Lithology and Thickness

Siltstone and Coal. Composed of black-grey calcareous fine siltstone, siltstone, grey fine-grained sandstone, grey-brown claystone, thin-bedded marl and bioclastic limestone, containing 4-5 layers of minable coal, with a thickness of 78 m.


Lithology Pattern: 
Siltstone


Relationships and Distribution

Lower contact

Conformable contact with the underlying Xuanwei Fm (Hsuanwei Fm)

Upper contact

Conformable contact with the overlying Feixianguan Fm of the lower Triassic Series or the Kayitou Fm (latest Permian-basal Triassic at column TJ102 in east Yunnan).

Regional extent

In a Memoir of the (Regional Geology of Guizhou Province, 1987), the Wangjiazhai Fm is regarded as a part of westerly extension of the Longtan Fm, and its underlying continental coal-bearing strata are known as the Xuanwei Fm (Hsuanwei Fm). By taking the Wangjiazhai (78 m) of the Shuicheng County of Guizhou Province as its center and in its extension northerly through the Zhengxiong and Weixin Counties of Yunnan Province to the Yunlian County (35 m) and the Xingwen County (40 m) of Sichuan Province the formation is characterized by an increase of limestone in amount and a shrinkage of its thickness, with the marine strata being decreasing in amount westward, and also with its stratigraphic horizon being gradually uprising to transition into the Xuanwei (Hsuanwei) Fm up to the Laowuji and Weining areas of the Panxian County.


GeoJSON

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Fossils

It yields ammonoids such as Pseudotirolites acutus, Pleuronodoceras anshunense, Rotodiscoceras longilobatum, River torulosum; such Fusulinids as Palaeofusulina guizhouensis; brachiopods such as Waagenites soochowensis, Oldhamina decipiens; and plant fossils (phytolites) such as Ullmannia cf. bronnii, whose stratigraphic horizon is corresponding to that of the Changxing Fm (Changhsing Fm)


Age 

Changhsingian Stage (late Lopingian Epoch; latest Permian). Overlying Kayitou Fm has a U-Pb date of 252.3 Ma near the base (hence mid-late Changhsingian).

Age Span: 

    Beginning stage: 
Changhsingian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
254.24

    Ending stage: 
Changhsingian

    Fraction up in the ending stage: 
0.7

    Ending date (Ma):  
252.60

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Fei Shuying

GeoJSON estimate by Can Cai and Xinyi Zhang (Chengdu Univ. Tech. students)