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Zhifang Formation
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Zhifang Fm base reconstruction

Zhifang Fm

Period: 
Devonian

Age Interval: 
D22 (2),


Province: 
Xinjiang

Type Locality and Naming

Eastern Junggar. The type section is located at 800 m northeast of Kokesairgai Peak, north of Zhifang Town, in East Junggar of Xinjiang Uygur Autonomous Region. It was named by Yang Shipu and others in 1981.


Lithology and Thickness

Sandstone, conglomerate. The Formation, more than 90 m thick, is characterized by grayish-green tuffaceous sandstone and conglomerate intercalated with lenses of sandy limestone and with a basal conglomerate.


Lithology Pattern: 
Coarse-grained sandstone


Relationships and Distribution

Lower contact

The Formation has a disconformable basal contact with the underlying Ulusubasite Fm.

Upper contact

The Formation has a faulted upper contact with overlying Keankuduk Fm (Ke'ankuduk Fm)

Regional extent

It has a restricted distribution and is mainly recognized in Kokesairgai and Taheirbasite.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[91.66,44.84],[89.95,44.24],[92.54,42.97],[96.24,42.81],[95.22,44.276],[91.66,44.84]]]]}}

Fossils

It contains plant Lepidodendropsis sp.;

coral Spongophyllum sp., Pachyfavosites sp.; and

brachiopoda Mucrospirifer sp., Productella sp., Praewaagenoconcha sp., Schuchertella sp.


Age 

late Middle Devonian

Age Span: 
S

    Beginning stage: 
Givetian

    Fraction up in beginning stage: 
0.2

    Beginning date (Ma): 
384.02

    Ending stage: 
Frasnian

    Fraction up in the ending stage: 
0.2

    Ending date (Ma):  
377.34

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

(Hou Hongfei)