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Linggou Formation

Linggou Fm

Period: 
Triassic

Age Interval: 
Early Triassic, T21, (TJ76)


Province: 
Shaanxi

Type Locality and Naming

The type section is located at Linggou, Chengjiachuan, Zhenan, Shaanxi. It was named by the tenth Geological Survey Group of Shaanxi Geological Bureau in 1966.

Synonym:


Lithology and Thickness

It is a set of grayish green-yellowish brown calcareous and sandy shale, mud-bearing microcrystalline limestone and calcareous mudstone. Lower part is light gray-green argillaceous microcrystalline limestone intercalated with calcareous sandstone. Middle and Upper parts are dark gray calcareous mudstone intercalated with calcareous sandstone, argillaceous microcrystalline limestone, and the middle part contains a set of oncolite and stromatolite limestone. Its thickness is about 700 m.


Lithology Pattern: 
Shallow-marine marl


Relationships and Distribution

Lower contact

This formation is conformable in contact to the underlying Lower Triassic Jinjiling Fm

Upper contact

Its top boundary is unclear.

Regional extent

The distribution of this formation is strictly limited to the core of the Jinjiling syncline in the Xikou area of Zhen'an County, Shaanxi Province.


GeoJSON

null

Fossils

Bivalves: Asoella illyrica, A. subillyrica and Daonella sp.


Age 

It was discovered a set of sandstone and calcareous shale with a thickness of about 800 m above the Lower Triassic of the type section, and they believed that the age may be the Middle Triassic (Jiang Chunfa et al. 1963). The tenth survey group of the Shaanxi Geological Bureau (1966) named this set of strata as Linggou Formation and determined the age as the Middle Triassic. The Shaanxi Bureau of Geology and Mineral Resources (1989) assigned its age as Early the Middle Triassic. This book follows it. In addition, Zhu Zhizhi and others (1984) thought the strata should be “Group” rather than “Formation”.

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: 
1.0

    Ending date (Ma):  
241.46

Depositional setting

It is interpreted as the shallow marine environment.


Depositional pattern:  


Additional Information


Compiler:  

Zhang Shunxin, Shu Wenchao and Tong Jinnan.