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Qusogma Formation

Qusogma Fm

Period: 
Carboniferous

Age Interval: 
C1 (33), Early Carboniferous


Province: 
Xizang (Tibet)

Type Locality and Naming

The type section is located at Qusogma, about 3 km west of Guchang Village, Marmê District, southwest Gerze County, Tibet. It was named by the Regional Geological Survey Party of Tibetan Bureau of Geology in 1987.


Lithology and Thickness

Claystone, Siltstone and Limestone. Rhythmic layers, irregular in thicknesses, of gray-green and black-gray shale, siltstone and gray organic-rich limestone with gray-yellow thin-bedded fine-grained quartz sandstone. Ripple marks, oblique bedding and organic traces are common in the sandy mudstone. Stable in lithology and lithofacies. Thickness >460.11 m.


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

Unknown: The bottom is unseen

Upper contact

Conformable contact with the Guchang Group

Regional extent

Exposed around Guchang, Marmê District, Gerze County


GeoJSON

null

Fossils

brachiopods Linoproductus sp., Brachythyrina sp. and Unispirifer sp.; Corals Rhopalolasma sp., Zaphrentites parallelus, Beichuanophyllum sp. and Bradyphyllum sp.


Age 

Early Carboniferous

Age Span: 

    Beginning stage: 
Visean

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
346.73

    Ending stage: 
Serpukhovian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
323.40

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Fan Yingnian