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Tongxin Formation

Tongxin Fm

Period: 
Silurian

Age Interval: 
Aeronian-Lower Telychian of Silurian (S1), (27)


Province: 
Ningxia

Type Locality and Naming

It was named by Gao Jianguo in 1987. The type section is situated at east of Zhaohuajing Village, Tongxing County, the Ningxia Hui Zizhiqu.

Synonym: (同心组), Tongxing Fm


Lithology and Thickness

It consists of purplish red thin- to medium-bedded calcareous-pelitic arkosic quartzose sandstone and pebbly sandstone; the base is composed of coarse-grained-sandy conglomerate including limestone pebbles; the sandstone is with horizontal bedding. The formation is 81 m in thickness in the type section.


Lithology Pattern: 
Coarse-grained sandstone


Relationships and Distribution

Lower contact

It is in pseudo-conformable contact relation with the underlying Zhaohuajing Fm

Upper contact

It is in pseudo-conformable contact relation with the overlying Hanxia Fm

Regional extent

It is confined within the area Zhaohuajin in Tongxin County in distribution.


GeoJSON

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Fossils

The coral, Mesofavosites, can be found in the pebbles of this formation.


Age 


Age Span: 

    Beginning stage: 
Aeronian

    Fraction up in beginning stage: 
0.3

    Beginning date (Ma): 
439.92

    Ending stage: 
Telychian

    Fraction up in the ending stage: 
0.3

    Ending date (Ma):  
436.89

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wang Chuanshang and Wang Xiaofeng