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Dengjia Formation
Click to display on map of the Ancient World at:
Dengjia Fm base reconstruction

Dengjia Fm

Period: 
Neoproterozoic

Age Interval: 
middle-Late Qingbaikouan (middle Tonian), Qb （60）


Province: 
Anhui

Type Locality and Naming

Southernmost Anhui. The Dengjia Fm was named by the Anhui Party of Regional Geologic Survey in 1971. The typical section is located in Dengjia village, Qimen County, Anhui Province. Lower formation in Likou Gr.

Synonym: （邓家组）


Lithology and Thickness

The Dengjia Fm is subdivided into three lithologic parts. Lower part is composed of greenish gray to gray white low-grade metamorphic micro-conglomerate and phyllitic pebbly medium-coarse lithic arkosic sandstone intercalated with phyllitic sericite-slate. Middle part consists of greenish gray to dark gray sericite-slate and silty sericite-slate with fine horizontal lamination. Upper part of the formation contains yellowish to greenish gray thick-bedded coarse arkosic sandstone and pebbly macro-grained quartzose sandstone. The thickness is more than 222 m.


Lithology Pattern: 
Coarse-grained sandstone


Relationships and Distribution

Lower contact

It overlies unconformably the underlying Shangxi Gr (Niuwu Fm)

Upper contact

Regional extent

Southernmost Anhui. It is well developed in Qimen County, Anhuia Province.


GeoJSON

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Fossils


Age 

middle-Late Qingbaikouan (middle Tonian) on schematic stratigraphic section

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.6

    Beginning date (Ma): 
832.00

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
0.7

    Ending date (Ma):  
804.00

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

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