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Denytangga Formation

Denytangga Fm


Period: 
Silurian

Age Interval: 
Llandovery of Silurian(S1), (37)


Province: 
Xizang (Tibet)

Type Locality and Naming

It was named by Guo Tieying et al. in 1982 and published in 1991. The type section is located at Denytangga, Burang Xian in Xizang Zizhiqu (approximately at about 80°58′E, 30°59′N).

Synonym: 德尼塘嘎组; Denitangga Fm


Lithology and Thickness

The formation, about 700 m in thickness, is dominated by purple, yellowish grey and dark grey thin-to-medium bedded dolomitic marble, argillaceous marble and bioclastic limestone of marine facies (Figure).

[Figure. The lower part of Denytangga Fm at the typical area of Burang Xian, Ngari Diqu, Xizang (Photography by Wang Guangxu)]


Lithology Pattern: 
Pelagic marl


Relationships and Distribution

Lower contact

The formation conformably contacts onto the underlying Songmusong Fm of the Upper Ordovician

Upper contact

it may probably be in unconformable contact with the overlying Qiangla Fm of the Lower Devonian or is just cut by fault.

Regional extent

The Denytangga Fm is exposed discontinuously from north of Gangjiu in Zhongba Xian to Denytangga of Burang Xian. Eastwards from the type section locality carbonate rock increased and southwestwards from there clastic rock considerably increased. The thickness of the formation is over 353 m in the Laangcuo area.


GeoJSON

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Fossils

It bears corals, Stromatopora, Bryozoa, brachiopod, etc. with the main elements as follows: corals Kodonophyllum sp., Heliolites sp., Guizhoustriatopora sp., Amplexoides sp., Thamnopora zandaensis, Cladopora sp.; stromatopor Actinostroma sp.


Age 


Age Span: 

    Beginning stage: 
Hirnantian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
444.14

    Ending stage: 
Gorstian

    Fraction up in the ending stage: 
0.0

    Ending date (Ma):  
426.74

Depositional setting


Depositional pattern:  


Additional Information


The formation was considered as a junior synonym of Pulu Fm by Xia (1997), the concept of Pulu Fm was defined broadly to include many formations, Pazhuo Fm, Jijiu Fm, Qiangla Group, Denytangga Fm, etc. The authors inclined to keep the names until further works proving the inconsistency of lithology, fossils, facies etc. among the formations.


Compiler:  

Wang Chuanshang and Wang Xiaofeng