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Baixiangdai Formation

Baixiangdai Fm

Period: 
Jurassic

Age Interval: 
Middle Jurassic, (TJ95a, TJ95b)


Province: 
Hunan

Type Locality and Naming

It was named by the Regional Survey Party of Hunan Province in 1980, and was first cited publicly by the Hunan Geological Bureau in 1988. The naming section is located in the Baixiangdai area extending till Fanjia in the vicinity of the Rucheng County, Hunan Province.

Synonym: （白香带组）


Lithology and Thickness

It is composed essentially of grey-white and grey-green feldspathic sandstone, feldspar-quartz sandstone and siltstone, intercalated with grey-green and purple mudstones, with a thickness of over 400 m.


Lithology Pattern: 
Fine-grained sandstone


Relationships and Distribution

Lower contact

Its basal part is in a disconformable contact with the underlying Shigu Fm

Upper contact

No top has been found. Regionally, the next younger unit is the Dongling Fm of mid-Early Cretaceous conglomerate and sandstone.

Regional extent

In addition to its distribution in the naming section, it is also found to occur in the areas of Huangnitang and Beixi of the Guidong County.


GeoJSON

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Fossils


Age 

No biotic fossils for expounding and proving the age of the formation have been found so far, and also there is no one who has applied whatever data to its age determination. So, both the definite stratigraphic position of it and its age have yet to be investigated further. Schematic strat column in previous "red Chinese Lexicon" had implied that the Baixiangdai Fm spanned the Bajocian-Callovian.

Age Span: 

    Beginning stage: 
Bajocian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
170.90

    Ending stage: 
Callovian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
161.53

Depositional setting

The formation represents deposits of fluvial and lacustrine facies.


Depositional pattern:  


Additional Information


Compiler:  

Jingeng Sha (coordinator)