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Qiankuntougou Formation
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Qiankuntougou Fm base reconstruction

Qiankuntougou Fm

Period: 
Devonian

Age Interval: 
D13 (75), Emsian (late Early Devonian)


Province: 
Inner Mongolia

Type Locality and Naming

The type section is located at Qikuntaogou of Aoji Village, Aohan Qi, Nei Mongol. It was named by No. 2 Team of Nei Mongol Regional Geological Survey in 1967, and was published in 1978 by Lioning Compiling Group for Regional Stratigraphical Scale.


Lithology and Thickness

Sandstone. The Formation, 1430 m thick, is dominated by feldspar sandstone, sandy slate, siltstone and basic volcaniclastics with limestone intercalations.


Lithology Pattern: 
Fine-grained sandstone


Relationships and Distribution

Lower contact

Its upper and lower boundaries are not exposed. But in this region, the next older formation is the Xiashibei Fm limestone of earliest Devonian

Upper contact

Its upper and lower boundaries are not exposed.

Regional extent


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[116.78,43.06],[115.07,42.85],[114.37,42.22],[115.22,41.64],[116.68,42.11],[117.22,42.73],[116.78,43.06]]]]}}

Fossils

Coral Wedekindophyllum sp., Amplexiphyllum sp., Chlamidophyllum sp., Rhizophyllum sp., Pachyfavosites sp., Favosites sp.; and brachiopoda Coelospira orientalis, Howellella sp., Acrospirifer sp., Plebejochonetes plebejus have been reported from this formation.


Age 

Emsian (late Early Devonian)

Age Span: 
S

    Beginning stage: 
Emsian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
402.41

    Ending stage: 
Eifelian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
389.80

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

(Su Yangzen)