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Heshui Formation
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Heshui Fm base reconstruction

Heshui Fm

Period: 
Cretaceous

Age Interval: 
Early Cretaceous, K1hs, (42b)


Province: 
Guangdong

Type Locality and Naming

Zheng Jiajian et al. (1974) firstly named the Heshui member by the Longtian section in the Xingning County. “Annals of Guangdong Regional Geology” (1988) referred the name of Heshui Formation to this group of strata. The type locality is at the Longtian section in the Xingning County of Guangdong (115º44', 24º14').


Lithology and Thickness

The Heshui Formation is a group of coarse-grained clastic rocks, with conglomerate in the lower part and sandstone, siltstone in the middle to upper part, interbedded with silty mudstone. It is 78~1065 m in thickness.


Lithology Pattern: 
Sandstone


Relationships and Distribution

Lower contact

It unconformably contacts with the underlying Guancaohu Fm.

Upper contact

It unconformably contacts with the overlying Yousheng Fm.

Regional extent

The formation is distributed in the Meixian, Xingning, Wuhua and Heyuan areas.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[116.73,24.34],[116.82,24.28],[116.82,24.17],[116.7,23.99],[116.43,23.89],[116.19,23.84],[115.93,23.6],[115.69,23.52],[115.48,23.49],[115.33,23.51],[115.26,23.68],[115.27,23.85],[115.4,23.97],[115.54,24.05],[115.67,24.17],[115.95,24.29],[116.11,24.28],[116.26,24.26],[116.44,24.32],[116.73,24.34]]]]}}

Fossils

The formation yields ostracods Cypridea, Mongolocypris, Lycopterocypris; bivalves Trigonioides sp., and others like conchostracans and plant.


Age 

Not given; for graphic purposes put as late-Early Cret.

Age Span: 

    Beginning stage: 
Aptian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
121.40

    Ending stage: 
Albian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
100.50

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao