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Bingmagou Formation

Bingmagou Fm

Period: 
Mesoproterozoic

Age Interval: 
Changchengian (Statherian) Ch (21)


Province: 
Henan

Type Locality and Naming

West Henan. The Bingmagou Fm was named by the Party of Regional Geological Survey, Henan Bureau of Geology in 1964. The type section is in the area north of Big-magou Village, Lüdian Township, Yichuan County, Henan Province. It is the lowermost formation in Ruyang Gr.

Synonym: （兵马沟组）; Xiaogoubei Fm, a synonym for Bingmagou Fm, is suggested to be abandoned


Lithology and Thickness

The formation is composed of purple red conglomerate, sandy conglomerate, sandstone and silty shale. The sandy conglomerate and sandstone possess monoclinic-bedding and cross-bedding. The sandstone contains glauconite and iron concretions. It is thickness changes greatly. In the type locality, the formation is 880 m thick.


Lithology Pattern: 
Coarse-grained sandstone


Relationships and Distribution

Lower contact

It is unconformably overlies volcanics of the Xiong'er Gr. It is unconformably underlain by the Archean Dengfeng Gr.

Upper contact

Diconformably overlain by the basal conglomerate of the Yunmengshan Fm

Regional extent

West Henan. The formation spreads in limited area, and crops out in western segment of Songshan mountain and north area of Jiyuan City, Henan Province.


GeoJSON

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Fossils


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: 
0.3

    Beginning date (Ma): 
1,740.00

    Ending stage: 
Statherian

    Fraction up in the ending stage: 
0.4

    Ending date (Ma):  
1,720.00

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

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