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Baiwan Formation
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Baiwan Fm base reconstruction

Baiwan Fm

Period: 
Cretaceous

Age Interval: 
Early Cretaceous, K1bw , (33c)


Province: 
Henan

Type Locality and Naming

Xichuan Basin region?. It was erected by the Henan Regional Geological Survey Team in 1978. Its type section is to the east of the Baiwan Village at the Zhaowan Reservoir of the Zhenping County, Henan Province.


Lithology and Thickness

The Baiwan Formation is built up by a set of gray green and yellow green sandy mudstone, which is roughly divided into two parts. Lower part is represented by gray green and yellow green mudstone and sandy mudstone with sandy conglomerate. Upper part is yellow and gray white massive marl with a small amount of gray green mudstone and sandy conglomerate. It is 327.6 m thick.


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

The basal part of the formation is unconformable contact separated from feldspar-quartz sandstone of the underlying Ganjiaogou Fm by the appearance of gray white sandy conglomerate.

Upper contact

The top of the formation is unconformable contact bounded by conglomerate at the base of the Gaogou Fm.

Regional extent

This formation only occurs around the Zhaowan Reservoir of Zhenping County, Nanyang, southwest Henan.


GeoJSON

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Fossils

The formation yields Ostracods Cypridea unicostata, C. baiwanensis, C. concina, Rhinocypris sp.; sporopollen Classopollis- Podocarpidites- Schizaeoisporites- Cicatricosisporites assemblage.


Age 

[For graphics, arbitrarily put in Aptian in this succession.]

Age Span: 

    Beginning stage: 
Aptian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
121.40

    Ending stage: 
Aptian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
113.20

Depositional setting

It belongs to shallow lacustrine facies.


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao