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Tectonic Features

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Pengjiu Formation
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Pengjiu Fm base reconstruction

Pengjiu Fm

Period: 
Permian

Age Interval: 
P3 (96), Wuchiapingian Stage (early Lopingian Epoch; early Late Permian)


Province: 
Guangxi

Type Locality and Naming

The type section is located at Pengjiu Village, Dazhi Country, Qinzhou County, Guangxi Zhuang Autonomous Region. It was named by Yin Bao’an, Chen Jian and Cai Ninghong in 1994.


Lithology and Thickness

Fining-upward clastics. Representing a suite of terrigenous coarse clastic rock strata composed of conglomerate, pebble-bearing sandstone, sandstone, and siltstone. Lower part is composed of light-grey massive conglomerate, conglomeratic sandstone and pebble-bearing sandstone, intercalated with siltstone. Middle part consists of light-grey-green and light-grey thin- and thick-bedded clayey siltstone and siltstone. Upper part is composed mainly of grey and dark-grey thin- and medium-bedded siltstone and clayey siltstone, intercalated with fine-grained sandstone and pebble-bearing sandstone. Total thickness of 1600-5044 m.


Lithology Pattern: 
Siltstone


Relationships and Distribution

Lower contact

Unconformable contact with the underlying Bancheng Fm

Upper contact

Disconformable contact with the overlying Banba Fm of the Middle Triassic Epoch

Regional extent

Distributed chiefly in the areas of Lingshan, Qinzhou, Fangcheng and Dongxing Counties, and in a NE-SW trend.


GeoJSON

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Fossils

Plant fossils such as Gigantopteris sp., Ullmannia aff. bronnii, Pecopteris hemitelioides, etc.; Brachiopods such as Leptodus sp., Neochonetes sp., Chonetes sp., Dictyoclostus cf. boliviensis var. chitichunensis, etc.; and Bivalves such as Eoschizodus sp., Aviculopecten? simplicostata, Euchondria sp., etc.,


Age 

Wuchiapingian Stage of the Lopingian Epoch

Age Span: 

    Beginning stage: 
Wuchiapingian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
259.55

    Ending stage: 
Changhsingian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
251.90

Depositional setting

It is interpreted as paralic-facies deposits (interfingered marine and continental coastal environments).


Depositional pattern:  


Additional Information


Compiler:  

Shang Qinghua