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Deriangma Formation
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Deriangma Fm base reconstruction

Deriangma Fm

Period: 
Devonian

Age Interval: 
D1 (23), Early Devonian


Province: 
Xizang (Tibet)

Type Locality and Naming

The type section is located at the top of Deri’angma Mt. in yongzhu, Xainza County, Xizang. It was named by Lin Baoyu in 1981.

Synonym: Deri'angma Fm


Lithology and Thickness

Metamorphosed Sandstone. It is composed of gray medium- to thick-bedded metamorphosed quartz sandstone. It is 183 m thick.


Lithology Pattern: 
Sandstone


Relationships and Distribution

Lower contact

Conformably on the underlying grayish-black thin-bedded clayey limestone, sandy limestone of the Riarjue Fm (or Riadang Fm or Riaju Fm on other Lexicon charts); but none of these are in English version. Therefore, underlain by Dardong Fm (of which its submitted English text also indicated it is the underlying formation to the Deri'angma Fm)

Upper contact

This formation is below the light-gray thick-bedded crystalline limestone of the Langma Fm.

Regional extent

This formation is mainly distributed in Xainza, Ombu, etc., in Xizang.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[87.26,31.74],[88.02,31.34],[88.74,30.95],[90.13,30.69],[90.43,30.96],[89.96,31.41],[88.538,31.74],[87.26,31.74]]]]}}

Fossils

It contains rare fossils.


Age 

Early Devonian

Age Span: 
S

    Beginning stage: 
Emsian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
410.51

    Ending stage: 
Emsian

    Fraction up in the ending stage: 
0.8

    Ending date (Ma):  
397.54

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

(Xian Siyuan)