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Shixiagou Formation
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Shixiagou Fm base reconstruction

Shixiagou Fm

Period: 
Devonian

Age Interval: 
D2 (20-east), Givetian (late Middle Devonian)


Province: 
Ningxia

Type Locality and Naming

The type section is located at Shixiagou of Baimaxiang Village, south of Niushoshan Hill, Zhongning County of Ningxia Hui Autonomous Region. It was named by Pang Jiang and others in 1980.


Lithology and Thickness

Siltstone and sandstone. The Shixiagou Formation is subdivided into four members. The entire Formation is 246 m thick.

First member is grayish-white to grayish-yellow medium- to thick-bedded feldspar quartz sandstone, with a 1-m-thick basal bed sandy conglomerate.

Second member consists of purplish-red siltstone with feldspar quartz sandstone intercalations.

Third member is characterized by grayish-white thick-bedded fine-grained quartz sandstone with a bed of purplish-red fine-grained quartz sandstone.

Fourth member is mainly composed of purplish-red siltstone, intercalated with a few beds of purplish-red thin- to medium-thick-bedded fine-grained feldspar quartz sandstone.


Lithology Pattern: 
Siltstone


Relationships and Distribution

Lower contact

The formation has an unconformable contact to the underlying Xiangshan Fm of Middle Cambrian.

Upper contact

The formation has an unconformable contact to the overlying Zhongning Fm.

Regional extent


GeoJSON

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Fossils

Fish fossils of Bothriolepis niushoushanensis and Quasipetalichthys cf. haikouensis mainly occur in the Second member.


Age 

Givetian (late Middle Devonian)

Age Span: 

    Beginning stage: 
Givetian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
385.30

    Ending stage: 
Givetian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
378.90

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

(Wang Shitao)