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Bailong Formation
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Bailong Fm base reconstruction

Bailong Fm

Period: 
Cretaceous

Age Interval: 
Early Cretaceous, K1bl, (32b)


Province: 
Sichuan

Type Locality and Naming

Sichuan Basin – central. The formation was erected by the Sichuan Team of Aerial Survey in 1980. Its type section is just in a fishpond around Shiqiaozi of Bailongchang of the Jiange County, Sichuan. The Bailong Formation erected stands for the clastic sedimentary rocks dominated by purple red sandy mudstone occurring around the fishpond at Shiqiaozi of Bailongchang, Jiange County in central north of the Sichuan Basin. It is the upper-middle formation of the Chengqiangyan Gr in the northern part of the Sichuan Basin.


Lithology and Thickness

The formation comprises light purple and gray massive arkose sandstone and purple red siltstone and mudstone. It is 246.3 m thick. It is persistent in lithology and 110-430 m thick.


Lithology Pattern: 
Fine-grained sandstone


Relationships and Distribution

Lower contact

Its basal part is conformably differentiated from the brick-red mudstone with thin-bedded siltstone of the underlying Cangxi Fm by the sandstone at Boxinchang.

Upper contact

Its top is bounded conformably by the purple gray thick-bedded fine-grained feldspar-quartz sandstone at the base of the Qiqusi Fm.

Regional extent

This formation is distributed in the northern part of the Sichuan Basin. The strata become thinner from northeast to southwest, vary form Tongjiang, Bazhong (300-430 m), Zitong, Jiangyou (170-240 m), to Santai and Zhongjiang (110-190 m).


GeoJSON

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Fossils

The formation yields Ostracods Jingguella paraovata, J.subtriangularis, J.elliptica, Cypridea bailongensis, C. shantaiensis, Deyangia renijormis; Pinnocypridea deyangensis, P. triangula, Jingguella baimaguanensis, Minheella antenna, M.minheensis, Dyangia subovata in Gudian of Zhongjiang; Rhinocypris dorsoconcava, R.quadrata, Deyangia deyangensis in Zhongjiang and Bazhong; bivalves Nakamuranata chingshanensis, Pseudohyxioides cangxiensis; Estherias Chuanestheria bijurcata, Migransia sp., Orthestheria sp.; Sporopollen Cicatricosisporites juncta, Cicatricosisporites sp. Schizaeoisporites sp. in Yanting; and Dinosaurian teeth Carnosauria.


Age 


Age Span: 

    Beginning stage: 
Hauterivian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
132.60

    Ending stage: 
Hauterivian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
126.50

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao