Home Multi-Country Search About Admin Login
Cenozoic
Cretaceous
Jurassic
Triassic
Permian
Carboniferous
Devonian
Silurian
Ordovician
Cambrian
Neoproterozoic
Mesoproterozoic

Search by
Select Region(s) to search
Hold Ctrl (Windows/Linux) or Command (Mac) to select multiple
Dashuigou Formation

Dashuigou Fm

Period: 
Permian

Age Interval: 
P2-P3 (71), Capitanian Stage (late Guadalupian Epoch) to Lopingian Epoch (late-Middle to Late Permian)


Province: 
Hubei

Type Locality and Naming

The type section is located at Dashuigou, Puxi area, Zhushan County, Hubei Province. It was named by the Hubei Regional Geological Survey Party in 1975, and was officially cited by the Bureau of Geology and Mineral Resources of Hubei Province in 1990.


Lithology and Thickness

Organic-rich Shale and Chert. Composed of two lithologic members. Lower member consists mainly of black thin-bedded carbonaceous and siliceous rocks, intercalated with carbonaceous shale and with its base being intercalated with lenticular limestone. Upper member consists chiefly of black carbonaceous and siliceous shale, intercalated with thin-bedded carbon-bearing siliceous rocks. The whole suite of rock series is abundant in organic (carbonaceous) and pyrite concretions. The maximum thickness of the formation is over 120 m, and is reducing westerly towards the area of Lutao Gorge to become as thinner as 50 m.


Lithology Pattern: 
Claystone


Relationships and Distribution

Lower contact

Conformable contact with the underlying Wawuwan Fm

Upper contact

Disconformable contact with the overlying Daye Fm of the Lower Triassic Series.

Regional extent

Distributed in the area of Zhuxi-Fangxian.


GeoJSON

null

Fossils

Lower part yields Ammonoids such as Shouchangoceras and Altudoceras. Upper part yields Ammonoids such as Anderssonoceras.


Age 

Its geological age should be of the Lengwuan Stage of the Yanghsingian Epoch (=Capitanian Stage (late Guadalupian Epoch; late-Middle Permian)) to Lopingian Epoch. Westerly until the Xiagaochuan area, Xixiang County, Shaanxi Province, the strata corresponding to the Dashuigou Fm should be assigned to the Longchi Fm of the Lengwuan Stage and the Guojiaya Fm of the Wuchiapingian Stage.

Age Span: 

    Beginning stage: 
Kungurian

    Fraction up in beginning stage: 
0.75

    Beginning date (Ma): 
276.60

    Ending stage: 
Wuchiapingian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
254.24

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Shang Qinghua