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Chaguoluoma Formation
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Chaguoluoma Fm base reconstruction

Chaguoluoma Fm

Period: 
Devonian

Age Interval: 
D2 (23), Middle to late Devonian


Province: 
Xizang (Tibet)

Type Locality and Naming

The type section is located in the area of Chaguoluoma to Dardong, north of Xainza County, the Xizang Autonomous Region. It was named by Xia Daixiang et al. in 1979.


Lithology and Thickness

Limestone. The formation is marked by a set of massively thick carbonate rocks. Lower part is gray to light-gray thick-bedded edgewise limestone. Upper part is light-gray to grayish-white thick-bedded limestone intercalated with bioclastic limestone.


Lithology Pattern: 
Limestone


Relationships and Distribution

Lower contact

Conformable contact onto the underlying banded limestone of the Middle to Lower Devonian Langma Fm.

Upper contact

Overlain by dark-gray thin-bedded clayey limestone of Upper Devonian (unnamed formation).

Regional extent

It is distributed at Yongzhuqiao, Tarma, etc. of Xainza County, the Xizang Autonomous Region.


GeoJSON

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Fossils


Age 

Middle Devonian [NOTE: the overlying "un-named Limestone formation" spanning Famennian on Devon chart is included here in this formation; which is consistent with the overlying Duonageli Fm of earliest Carboniferous (Carb-column61) that is indicated "conformable on underlying Chaguoluoma Fm"]

Age Span: 
S

    Beginning stage: 
Givetian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
385.30

    Ending stage: 
Famennian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
359.30

Depositional setting

It is interpreted as a shallow-water carbonate platform facies.


Depositional pattern:  


Additional Information


Compiler:  

(Xian Siyuan)