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Dawuba Formation

Dawuba Fm

Period: 
Carboniferous

Age Interval: 
C1 (48), middle Early Carboniferous


Province: 
Guizhou

Type Locality and Naming

The type section is at Dawuba (Village), 1 km northwest of Muhua, Changshun, Guizhou. It was named by Hou Hongfei et al. in 1985.


Lithology and Thickness

Claystone, Chert and Marl. Lower part consists of gray-black shale, silty shale intercalated with thin-bedded chert and minor siltstone, commonly containing ferruginous and phosphate nodules. Upper part is of gray-black medium- to thin-bedded dense marls intercalated with calcareous and clayey shales, with micro-horizontal stratification. Pyrite crystals are occasionally found, containing small-sized brachiopods. Ascending, cherts are decreasing and calcareous matter is decreasing. It is a total of 150 m thick, and may reach 230 m around Wangyou.


Lithology Pattern: 
Claystone


Relationships and Distribution

Lower contact

Conformable contact with the underlying Muhua Fm. At Daihua, it lies disconformably over the Daihua Fm.

Upper contact

Conformable contact with the overlying Kueichouphyllum-bearing thick-bedded limestone. (Caohai Fm lower member?)

Regional extent

Widely distributed in the Pu’an-Mawei subarea and around Ziyun and Langdai


GeoJSON

null

Fossils

Spores are found at the bottom.


Age 

middle Early Carboniferous

Age Span: 

    Beginning stage: 
Visean

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
346.73

    Ending stage: 
Visean

    Fraction up in the ending stage: 
0.33

    Ending date (Ma):  
341.32

Depositional setting

It is interpreted as a platform margin slope facies


Depositional pattern:  


Additional Information


Compiler:  

Wang Hongdi