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Mesoproterozoic

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Shennongjia Gr

Shennongjia Gr

Period: 
Mesoproterozoic

Age Interval: 
Xishanian-Yuxian (Ectasian-Stenian), Xs-Yx (28)


Province: 
Hubei

Type Locality and Naming

Central-westernmost Hubei. The Shennongjia Gr was named by Jiang Tao and Hua Meichun in 1962. The type section is in Shennongjia Forest District, Hubei Province.

[Figure: Geological map and lithological unite of the Shennongjia Gr (modified from Kuang Hongwei, 2018)]

Synonym: （神农架群）, Dagushi Gr, Baiguoshu Dolomite, and Wuziping Gr are thought to be different names for the same group


Lithology and Thickness

The Shennongjia Gr is composed of magnesian carbonate (dolomitic) rocks, clastic rocks and volcanic rocks. The carbonate rock contains a rich diversity of stromatolites and microplants. According to present subdivision, the group is subdivided into 12 formations from bottom to top: Yingwodong Fm, Dayanping Fm, Macaoyuan Fm, Luanshigou Fm, Dawokeng Fm, Kuangshishan Fm, Taizi Fm, Yemahe Fm, Wenshuihe Fm, Shicaohe Fm, Songziyuan Fm and Wagangxi Fm. [Macaoyuan Fm is now separated, and is lowermost Neoproterozoic.] The thickness is recorded as over 12680 m.


Lithology Pattern: 
Dolomite


Relationships and Distribution

Lower contact

In Shennongjia district the bottom of the formation is not seen; however, in north periphery of Huangling fault rise at Shanshuya-Xichahe, and Xiongjiapo-Kongzihe, it is in unconformable contact with the underlying Shuiyuesi Group (Luanshigou Fm?) of Paleoproterozoic (Li Fuxi et al., 1989).

Upper contact

The top was unconformably overlapped by the Liantuo Fm or the Nantuo Fm Tillite respectively. Schematic stratigraphic column indicates the next younger regional unit is the Macaoyuan Fm (formerly within this Shennongjia Gr)

Regional extent

Central-westernmost Hubei. It is mainly developed in Shennongjia Forest District, Hubei Province.


GeoJSON

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Fossils


Age 

As to its chronological age, it roughly spans the range from 1000 Ma to 1400 Ma (Li Huaikun et al., 2014). Schematic stratigraphic section and age constraints suggests span of Xishanian through Yuxian (Ectasian through Stenian) for the 10 formations with the basal Yingwodong Fm as uppermost Jixianian.

Age Span: 

    Beginning stage: 
Ectasian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
1,400.00

    Ending stage: 
Stenian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
1,000.00

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.