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Dazhongzhai Formation

Dazhongzhai Fm

Period: 
Devonian

Age Interval: 
D11-2 ,Lochkovian(?)-Pragian (Early Devonian)


Province: 
Yunnan

Type Locality and Naming

The type section is located near Bitijie, about 10 km northeast of Mojiang County, Yunnan. It was named by Yunnan No 2 Team of Regional Geological Survey in 1975.


Lithology and Thickness

Sandstone. The lithologic character is gray to yellowish-gray quartz sandstone, siltstone intercalated with black shale, and with flysch structures.

The exposed thickness is 573.5 m.


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

Uncertain: At the type section, the bottom portion is incomplete, therefore the lower contact relations are uncertain.

Upper contact

Uncertain: At the type section, the top portion is incomplete, therefore the upper contact relations are uncertain.

Regional extent

The distribution of the formation is confined to the area of Dazhounzhai, Bilijie and Baishangcun in Mojiang County.


GeoJSON

null

Fossils

The upper part yields the graptolite Monograptus yukounensis fangensis and tentaculites Nowakia acuaria.


Age 

Lochkovian(?)-Pragian (Early Devonian)

Age Span: 

    Beginning stage: 
Lochkovian

    Fraction up in beginning stage: 
0.7

    Beginning date (Ma): 
414.38

    Ending stage: 
Pragian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
410.51

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

(Xian Siyuan)