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Zhashui Gr

Zhashui Gr

Period: 
Devonian

Age Interval: 
D2-3 (38), Middle to Late Devonian


Province: 
Shaanxi

Type Locality and Naming

The type section is located at Zhaishui area, Shaanxi Province. It was named by Zhao Yazheng (Y.C. Chao) and Huang Jiqing (T.K. Huang) in 1931.

Formations in Group (ascending): Niuerchuan Fm, Chigou Fm, Qingshiya Fm, and Tongyusi Fm


Lithology and Thickness

The Group is characterized by fine-grained quartz sandstone, feldspar quartz sandstone, siltstone and slate with a few limestone beds. It has an exposed thickness of 7000-11000 m.


Lithology Pattern: 
Sandstone


Relationships and Distribution

Lower contact

The Group is faulted in contact with both the underlying and overlying stratigraphic units.

Upper contact

The Group is faulted in contact with both the underlying and overlying stratigraphic units.

Regional extent


GeoJSON

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Fossils

The Group contains brachiopods ?Atrypa sp. and plants Leptophloeum rhombicum.


Age 

Middle to Late Devonian

Age Span: 

    Beginning stage: 
Givetian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
385.30

    Ending stage: 
Famennian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
359.30

Depositional setting


Depositional pattern:  


Additional Information

Zhao and Huang named a set of quartzite and slate developed in Zhaishui area as Zhaishui Series and suggested a Sinian-Ordovician in age. On the basis of fossils it was considered to be Devonian in age and is subdivided into several formations, in ascending order, Niuerchuan Fm, Chigou Fm, Qingshiya Fm and Tongyusi Fm.


Compiler:  

(Cao Xuanduo)