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Hongling Formation
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Hongling Fm base reconstruction

Hongling Fm

Period: 
Neoproterozoic

Age Interval: 
Z (20)


Province: 
Henan

Type Locality and Naming

Central Henan-Hubei border region. The Hongling Fm was named by Ma Xingyuan et al. in 1975. The typical section is situated in Hongling of Foguangyu, Yanshi County, Henan Province.

Synonym: （红岭组）


Lithology and Thickness

The Hongling Fm is subdivided into three parts. Lower part consists of grayish yellow carbonaceous shale and purple red shale intercalated with siltstone, bearing basal carbonaceous quartzose sandstone and thick-bedded feldspathic siltstone. Middle part is a dolomitic limestone with siliceous lumps. Upper part is composed of gray, purple red dolomitic limestone. The Hongling Formation of a thickness more than 100 m.


Lithology Pattern: 
Dolomitic limestone


Relationships and Distribution

Lower contact

The base of the formation in the type section has a fault contact to the underlying Heyao Fm

Upper contact

The top with gray thick-bedded dolomite disconformably underlies the Lower Cambrian Xinji Fm

Regional extent

Central Henan-Hubei border region. It is restricted around Mayao and Baiyugou east of Foguangyu in Yanshi County, with an area of only several km2.


GeoJSON

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Fossils

The dolomite was found to yield stromatolites Inzeria f., Jurusania f., J. cyindrica, J. alicica, Jacutophyton f.; and the carbonaceous shale yields abundant microplants: Leiopsophosphaera sp., Laminarites sp., Stictosphaeridium sp., Synsphaeridium conglutinatum, Trachysphaeridium sp., Taeniatum simplex, Psuedozonosphaera nucleolata and Polysphaeroides cf. contertus.


Age 


Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.8

    Beginning date (Ma): 
776.00

    Ending stage: 
Cryogenian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
635.00

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.