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Wenduraobaote Formation
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Wenduraobaote Fm base reconstruction

Wenduraobaote Fm

Period: 
Devonian

Age Interval: 
D13-D21 (4), Emsian to Eifelian (late Early Devonian to early Middle Devonian)


Province: 
Inner Mongolia

Type Locality and Naming

The type section is located in north of Wenduraobaote and Aobaotinghundi, the west hill of east Wuchumuqinqi, Inner Mongolia Autonomous Region. It was named by Inner Mongolia Team of Regional Geological survey in 1973 during mapping the “East Wuchumuqinqi Geological Map (scale is 1:20000)”.

Synonym: Wenduraobaote Gr (Group)


Lithology and Thickness

Tuff. The lithology is complex and is mainly composed of tuff, crystal lithoclastic tuff, siltstone, feldspathic quartz sandstone and slate. Characteristic markers are the content of thin beds or lenses of limestone that are distributed very steady along strike. Limestone beds can attain 30 m in thickness and commonly are lenses.

The outcropped thickness can reach 1228 m.


Lithology Pattern: 
Volcanic_ash


Relationships and Distribution

Lower contact

Thin beds or lenses of limestone make it easy to differentiate this formation from the conformably underlying Aobaotinghundi Fm.

Upper contact

Regionally, unconformably overlain by late-Late Devonian tuffs of Honggermiao Fm; or locally conformably overlain by siltstone of Taerbaogete Fm.

Regional extent


GeoJSON

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Fossils

Characteristic markers are the content of thin beds or lenses of limestone that are distributed very steady along strike and contain abundant Tetracoralla and brachiopods fossils.

The formation yields brachiopods Tridensilis app, "Paraspirifer" sp., Narelophyllum sp., Cylindrophyllum sp., Keriophyllum sp.; and stromatopora Anostylostroma sp., Trupebostroma sp., etc.


Age 

Emsian to Eifelian (late Early Devonian to early Middle Devonian)

Age Span: 
S

    Beginning stage: 
Emsian

    Fraction up in beginning stage: 
0.8

    Beginning date (Ma): 
397.54

    Ending stage: 
Eifelian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
385.30

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

(Hou Hongfei)