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Yetang Formation
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Yetang Fm base reconstruction

Yetang Fm

Period: 
Cretaceous

Age Interval: 
Late Cretaceous, K2yt, (42b)


Province: 
Guangdong

Type Locality and Naming

Zheng Jiajian et al. (1974) named the Yetang Formation in the Xingning County. The type locality is at the Longtian section in the Xingning County of Guangdong (115º44', 24º14').


Lithology and Thickness

The Yetang Formation is composed of brownish red siltstone, calcareous siltstone and silty mudstone with intercalations of greyish green calcareous mudstone, silty marl, and thin-bedded gypsum. A volcanic conglomerate bed occurs at the base. It is 203 to 2270 m in thickness.


Lithology Pattern: 
Siltstone


Relationships and Distribution

Lower contact

It rests unconformably on the Yousheng Fm.

Upper contact

Regional extent

The Yetang Formation is distributed in the area of Meixian, Xingning, Wuhua and Longchuan.


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

This formation yields charophyte Charites tenuis; ostracods Lycopterocypris sp. and others like conchostracans, plant, spore and pollen.


Age 

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

Age Span: 

    Beginning stage: 
Coniacian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
89.39

    Ending stage: 
Campanian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
72.17

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao