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Zhaojiashan Formation

Zhaojiashan Fm

Period: 
Carboniferous

Age Interval: 
C21−C12 (48), late Visean and early Serpukhovian (late Early Carboniferous)


Province: 
Guizhou

Type Locality and Naming

The type section is lies at Toupo, about 3 km east of Weining County Seat, Guizhou. It was named by West Guizhou Team on Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences in 1965.


Lithology and Thickness

Dolomite. Gray and gray-white dolomitic crystalline limestone, ~200 m thick.


Lithology Pattern: 
Dolomitic limestone


Relationships and Distribution

Lower contact

Conformable contact with the underlying Xinguanting Member of Caohai Fm

Upper contact

Conformable contact with the overlying Huanglong Fm and Weining Fm (or transitional upward to Dewu Fm, which is partly coeval)

Regional extent


GeoJSON

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Fossils

Brachiopod Gondolina-Gigantoproductu edelburgensis assemblage; the Coral Palaeosmilia stutchburyi assemblage in Lower part and Dibunophyllum turbinatum-Lithostrotion decipiens assemblage in Upper part; the Ammonoid Homoceras zone; and the fusulinid Eostaffella zone.


Age 

late Visean and early Serpukhovian, roughly correlative with the D2 subzone in the upper Visean and the E and H zones in the lower Namurian of Western Europe.

Age Span: 

    Beginning stage: 
Serpukhovian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
330.34

    Ending stage: 
Serpukhovian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
326.87

Depositional setting

It is interpreted as platform neritic deposits


Depositional pattern:  


Additional Information


Compiler:  

Wang Hongdi