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Zhecun Formation

Zhecun Fm

Period: 
Triassic

Age Interval: 
Middle Late Triassic (TJ47a)


Province: 
Xizang (Tibet)

Type Locality and Naming

Tibet Geological Bureau of the South Tibet Geological Team in 1963 named "Chicun Section", Tibet District Survey Team in 1979 for the first time publicly quoted. The named section is located from Langjiexue to the Northern Slope of Zhala Mountain in Gongga County, Tibet. Upper formation in Niru Gr?

Synonym: Chacun Fm [See nomenclature history in Sunuolin Fm entry]. In 1976, the Second Geological Team of Tibet Geological Bureau and Wuhan Institute of Geology named the strata with similar meaning as the "Xuekang Formation" in Qiongjie area.


Lithology and Thickness

It is composed of black and black gray shale and sandstone interbedded with limestone lens, which is 645 m thick.


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

The bottom boundary marked by black shale conformably overlies onto the Upper Triassic Sunolin Fm (Sunuolin Fm)

Upper contact

It is in fault contact with the overlying Jurassic (Ritang Fm ?)

Regional extent


GeoJSON

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Fossils

Bivalves: Halobia sp., Monotis cf. salinaria


Age 

Schematic stratigraphic section indicates it spans the Norian.

Age Span: 

    Beginning stage: 
Norian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
227.30

    Ending stage: 
Norian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
205.74

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Zhang Shunxin, Zhou Ze and Tong Jinnan.