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Beidajian Formation

Beidajian Fm

Period: 
Mesoproterozoic

Age Interval: 
Changchengian (Statherian) Ch (21)


Province: 
Henan

Type Locality and Naming

West Henan. The Beidajian Fm was named by Han Yingshan and Yan Lianquan in 1952. The type section is in Cuizhuang Village, Xia-hexi Town of Ruyang County, Henan Province. It is the upper formation of the Ruyang Gr.

Synonym: (北大尖组)


Lithology and Thickness

In the type section, the Beidajian Fm consists mainly of grey-white, yellow-brown quartz sandstone, feldspar quartz-sandstone intercalated with glauconite quartz sandstone. The upper part bears poor iron ore. Dolomite is seen on the top. Wedge pattern and platy oblique bedding are developed in the upper dolomitic sandstone. It is 198 m thick in the type section; and thickness of the formation generally varies from 200 m to 400 m.


Lithology Pattern: 
Sandstone


Relationships and Distribution

Lower contact

The base, marked by the appearance of light-colored quartz sandstone, conformably overlies the underlying Baicaoping Fm (middle formation of the Ruyang Gr).

Upper contact

The top is disconformity overlain by the Luoquan Fm or the Xinji Fm.

Regional extent

West Henan. The Beidajian Fm is distributed mainly in western Henan Province.


GeoJSON

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Fossils

The mainly microplants in the formation are Trematosphaeridium holtedahlii, T. minutum, Polyporata obsoleta.


Age 

Schematic stratigraphic column shows as middle Changchengian (middle Statherian), and the 4 formations of this Ruyang Gr are given equal spans for the graphics.

Age Span: 

    Beginning stage: 
Statherian

    Fraction up in beginning stage: 
0.6

    Beginning date (Ma): 
1,680.00

    Ending stage: 
Statherian

    Fraction up in the ending stage: 
0.7

    Ending date (Ma):  
1,660.00

Depositional setting


Depositional pattern:  


Additional Information

Upper Luoyu Bed, Wuwanhougou bed and Daimeizhai Bed in Songshan Mountain region are the different names (synonyms) for the same strata of the Beidajian Fm. For this reason, the mentioned names are abandoned.


Compiler:  

Extracts from The Mesoproterozoic Erathem (chapter in Stratigraphic Lexicon of China, draft of 2022) by Gao Linzhi, Ding Xiaozhong, Zhang Chuanheng, Zhang Heng.