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Mesoproterozoic

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Ruyang Gr

Ruyang Gr

Period: 
Mesoproterozoic

Age Interval: 
Changchengian (Statherian) Ch (21)


Province: 
Henan, Shanxi

Type Locality and Naming

West Henan. The Ruyang Gr was named by Jin Shouwen in 1976. The group was established in Ruyang, Henan Province.

Synonym: （汝阳群）


Lithology and Thickness

The group is composed of clastic rocks. The base consists of conglomerate, The Ruyan Group consists of the Bingmagou Fm, Yunmengshan Fm, Baicaoping Fm and Beidajian Fm. [See the Lexicon entries for those formations for details.] The total thickness is recorded to 13070 m.


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

It overlaps on volcanics of the Xiong'er Gr or older strata.

Upper contact

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

Regional extent

West Henan-South Shanxi. The group is widely distributed in the area east of Xiong'er Mountain, Henan Province and southern Shanxi Province. Beside these, it also sporadically crops out in southeastern Henan Province.


GeoJSON

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Fossils

Microplants: Leiopsophasphaera, Trematosphaeridium, Leiaminuscula and Taeniatum. The dolomite occurring in the top of the Beidajian Fm contains stromatolites, such as Baicalia baicalica, Inzeria f.


Age 

IC-P-MS U-Pb date on zircon is 1611±8 Ma (Su Wenbo et al., 2012). 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: 
0.7

    Ending date (Ma):  
1,660.00

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.