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Tianqiaoling Formation

Tianqiaoling Fm

Period: 
Triassic

Age Interval: 
Late Late Triassic (TJ11a)


Province: 
Jilin

Type Locality and Naming

The type section is located at the upstream of Tuopangou River in Tianqiaoling Village, Wangqing Country, Qilin. It was named by the Area Survey Team of Jilin Geological Bureau.

Synonym: The metamorphic acid volcanic rocks distributed in the area of Tianqiao Ling and Caopigou in Wangqing County was named as Tianqiao Ling group by the geotechnical survey team of Jilin Geological Bureau in 1960, which was dated as Permian.


Lithology and Thickness

This formation, 852 m thick, is mainly composed of grayish-yellow, grayish-white rhyolite intercalated with a small amount of acid tuff.


Lithology Pattern: 
Volcanics


Relationships and Distribution

Lower contact

The Tianqiaoling Fm is disconformable in contact to underlying Malugou Fm with a bed of breccia tuff.

Upper contact

It is faulted in contact to overlying Helong Gr

Regional extent

The formation is mainly distributed at upstream of Tuopangou River in Tianqiaoling Basin and northern Malugou of Jilin.


GeoJSON

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Fossils

This formation yields fossil plants including Cycadocarpidium sp., Taeniopteris sp., Dictyozamites sp.


Age 

In 1966, this survey team suggested that the Tianqiao Formation was a set of acid lava and tuff rocks located above the Helong Group belonging to Middle and Upper Jurassic. In 1977, Wu Shuibo et al. believed that the Tianqiaoling Formation was above the Malugou Formation, which belonged to Late Triassic. According to the plant fossils, Sun Ge suggested that the age of this formation belonged to the Middle and Late Triassic in 1979~1993. Shown dashed as only Rhaetian on schematic stratigraphic column.

Age Span: 

    Beginning stage: 
Rhaetian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
205.74

    Ending stage: 
Rhaetian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
201.36

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Cao Hongsheng, Wu Yuyang and Tong Jinnan.