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Tongtoujian Formation

Tongtoujian Fm

Period: 
Triassic

Age Interval: 
Late Middle Triassic to early Late Triassic (TJ84a, TJ84b)


Province: 
Anhui

Type Locality and Naming

The type section is located at the Tongtoujian near the Yueshan in Huaining Country, Anhui. It was named by 326 Geological Team of Anhui Geological Bureau in 1962, and published formally in 1966.

Synonym:


Lithology and Thickness

This formation, 1700 thick, is mainly composed of purplish-pink siltstone, silty mudstone intercalated with fine sandstone, yielding cross bedding and ripple marks.


Lithology Pattern: 
Siltstone


Relationships and Distribution

Lower contact

The Tongtoujian Fm is conformable in contact to underlying Yueshan Fm with the purplish-red, livid, greyish-green, greyish-brown siltstone at the bottom. Mainly it is an upward color change in the siltstone from greenish-grey to purplish-pink.

Upper contact

It is disconformable in contact to overlying purplish-red and brownish-yellow conglomerate of Lalijian Fm

Regional extent

The formation is restrictively distributed in Wuhu and Anqing.


GeoJSON

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Fossils

This formation yields bivalves Eumorphotis (Asoella) illyrica, Costatoria.


Age 

Tong et al. (2019, Triassic integrated stratigraphy and timescale in China, Science China: Earth Sciences, v. 62, no. 1) assign as middle to late Ladinian.

Age Span: 

    Beginning stage: 
Ladinian

    Fraction up in beginning stage: 
0.3

    Beginning date (Ma): 
240.12

    Ending stage: 
Ladinian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
237.00

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Zhou Huiqin, Wu Yuyang and Tong Jinnan.