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Jiuzhou Formation
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Jiuzhou Fm base reconstruction

Jiuzhou Fm

Period: 
Cretaceous

Age Interval: 
Late Cretaceous, K2jz, (40)


Province: 
Guizhou

Type Locality and Naming

Guihou – central. The Jiuzhou Formation was erected by the Guizhou Bureau of Geology and Mineral Resources in 1987. The section for the designation is in Jiuzhou of Huangping, Guizhou.


Lithology and Thickness

The Jiuzhou Formation is mainly represented by a set of clastic rocks consisting of purple red and brick-red conglomerate, gravel-bearing sandstone, siltstone and mudstone. It is 110.8 m thick.


Lithology Pattern: 
Conglomerate


Relationships and Distribution

Lower contact

Its base marked by brick-red massive conglomerate is distinguished from brick-red and yellow massive gravel-bearing sandstone of the underlying Zazuo Fm. It lies conformably or disconformably on the underlying Zazuo Fm, but shows an angular discordance with the underlying strata prior to the Cretaceous.

Upper contact

Its top is marked by yellow gray gravel beds of the Quaternary. It shows an angular discordance with the overlying strata.

Regional extent

The formation occurs in Zazuo of Xiuwen, Jiuzhou of Huangping, Shibing and Rongjiang of southern Guizhou. It is quite persistent in lithology and varies considerably in thickness, ranging from 5 to 230 m.


GeoJSON

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Fossils

It yields ostracods Talicypridea latiovata, T. amoena, Cypridea sp., Metacypris sp., Cypris sp., Cyprinotus sp.; Charophytes Cyrogona xindianensis, Charites guanpingensis, Nemegtichara microcylindrica, Obrusochara luodianensis.


Age 


Age Span: 

    Beginning stage: 
Campanian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
77.91

    Ending stage: 
Maastrichtian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
66.04

Depositional setting

It is of fluvial-lacustrine deposition.


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao