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Qilinshan Formation

Qilinshan Fm

Period: 
Triassic

Age Interval: 
Middle Triassic. (TJ95a)


Province: 
Hunan

Type Locality and Naming

Beijing Institute of Geology named in 1959, Hunan survey team in 1973 for the first time publicly quoted. The reference section is located near the Ma Bridge in Lianyuan, Hunan Province.

Synonym:


Lithology and Thickness

It is mainly composed of calcareous silty shale containing mica, siltstone, limestone and sandy marl. The residual thickness ranges from 261 m to 523 m.


Lithology Pattern: 
Claystone


Relationships and Distribution

Lower contact

At the bottom, the yellow-green shale is in conformable contact with the limestone at the top of the underlying Daye Group (Guanzishan Fm).

Upper contact

Regionally, the next younger unit is the Chutanlong Fm of Norian.

Regional extent

Distribution is limited, only seen in Lianyuan, Hunan, Shuangfeng area, due to denudation did not peak.


GeoJSON

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Fossils

There are bivalve fossils Leptochondria sp., Posidonia sp., Amonotis sp., Nuculana sp. and conodont Coenudina sp. found only on the bottom.


Age 

Named as "Qilinshan layer", it represents the upper strata of the Lower Triassic in the Hunan Shuangfeng belt, but no named section has been specified. In 1972, the survey team in Hunan Province took the Maqiaobian section in Lianyuan, Hunan Province as the representative, and renamed it Qilinshan Formation, which represents the clastic rock strata in the upper part of the Lower Triassic in the Lianyuan area. The middle Triassic bivalves were collected from the bottom of the Majiabian Formation in Ganxi, Lianyuan in 1980, and the age of the bivalves was determined to be the middle Triassic. In 1992, Wang Zunzhou et al. confirmed that the age of this group was the Middle Triassic through the conodont data of Majiabian section.

Age Span: 

    Beginning stage: 
Anisian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
246.70

    Ending stage: 
Ladinian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
237.00

Depositional setting

It is interpreted as coastal facies deposit


Depositional pattern:  


Additional Information


Compiler:  

Zhang Shunxin, Xiong Feng and Tong Jinnan.