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Niru Formation

Niru Fm

Period: 
Triassic

Age Interval: 
Early Middle Triassic (TJ71)


Province: 
Yunnan

Type Locality and Naming

The type section is located in Niru Village, Luoji District, Zhongdian County (now called "Shangri-La" County), Yunnan Province. And it was named by Yunnan Geological Bureau in 1990.

Synonym:


Lithology and Thickness

Lower section is clastic rock interbedded with basalt volcanic tuff. Upper section is limestone. Thickness is greater than 1919m.


Lithology Pattern: 
Volcanic ash


Relationships and Distribution

Lower contact

It has conformity contact with the underlying Xiabulun Fm (= Bulun Fm in this Lexicon usage)

Upper contact

Regional extent

The Formation is mainly distributed in Zhongdian, Yunnan. The Jiedi Fm is coeval limestone but with a lower mudstone (not tuff) in the same Zhongdian County.


GeoJSON

null

Fossils

Bivalves: Neoschizodus laevigatus, Bakevellia costata, Plagiostoma cf. bourreti, Leptochondria subparadoxica, Costatoria sp., C. goldfussi mansuyi.


Age 

Anisian-Ladinian; but adjusted for graphic purposes to show Jiedi Fm (which has NO lower tuff) in same county.

Age Span: 

    Beginning stage: 
Anisian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
246.70

    Ending stage: 
Anisian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
244.08

Depositional setting

Marine facies


Depositional pattern:  


Additional Information


Compiler:  

Zhang Shunxin, Sun Xin and Tong Jinnan.