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Lingwen Formation

Lingwen Fm

Period: 
Triassic

Age Interval: 
Late Early Triassic, (TJ108)


Province: 
Hainan

Type Locality and Naming

The type section is located at Lingwen, Dingan County, Hainan and the reference section is located at Jiuqujiang, Qionghai, Hainan. It was named by the Guangdong District Geological Survey Group in 1964. And it was firstly used for publication by Chinese Academy of Geological Sciences in 1973.

Synonym: It was firstly named as “Lingwen Group”, which contains a set of inland clastic rock deposits.


Lithology and Thickness

It is a set of dark gray and gray inland clastic rocks. Lower part is dominated by conglomerate and unequal-grained sandstone; Upper part is composed of gray, dark gray shale, silty shale and siltstone. Its thickness is 580 m at Jiuqujiang and 114 m at Lingwen.


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

Its bottom was characterized by the gray and brown conglomerates, which are in unconformity contact with the Baoban Gr (Precambrian) as a set of mixed schists.

Upper contact

Its top part is unclear.

Regional extent

This formation is only distributed at Jiuqujiang, Qionghai and Lingwen, Dingan, Hainan.


GeoJSON

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Fossils

Plants: Phyllotheca sp., Equisetites sp., Neocalamites sp., Asterotheca szeiana, Caulopteris, Neuropteridium marginum, Walchia sp., Albertia latifolia, Voltzia heterophylla and some insect fossils.


Age 

And its age was assigned to Early Jurassic. Zhou Zhiyan and Li Baoxian (1979) thought some plant fossil elements were similar to those from Buntsandstein sandstone of western Europe and they thought the age of this formation should be Late Early Triassic. In addition, they established a new name as Jiuqujiang Fm or “Lingwen Gr”. After that, Hainan Geological Survey Group (1983) and Yichang Institute of Geology and Mineral Resources (1986) and Hainan Bureau of Geology and Mineral Resources (1992) called it as “Lingwen Fm” and thought its age should be Early Triassic. Schematic stratigraphic column indicates Olenekian span.

Age Span: 

    Beginning stage: 
Olenekian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
249.88

    Ending stage: 
Olenekian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
246.70

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Zhou Huiqin, Shu Wenchao and Tong Jinnan.