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Liuluocun Formation
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Liuluocun Fm base reconstruction

Liuluocun Fm

Period: 
Cretaceous

Age Interval: 
Early Cretaceous, K1ll, (43b)


Province: 
Hainan

Type Locality and Naming

Sanya Basin. The Liuluocun Formation was erected by the Hainan Geological Brigade in 1994. The section for the designation is in Liuluocun of the Sanya City of Hainan.


Lithology and Thickness

The Liuluocun Formation is dominated by andesitic tuff, which is divided into two members. The lower part of the Lower member is built up by volcanic breccia-rhyolitic tuff and the upper part andesite and andesite tuff. Upper memberis rhyolitic tuff with felsite and rhyolite. It is 3308 m thick. The rhyolitic gravel-bearing crystal tuff lava has given U-Pb age of 104-107 Ma.


Lithology Pattern: 
Volcanic ash


Relationships and Distribution

Lower contact

The base is unknown in the type area. In the Wuzhi Mountain, it lies unconformably on the underlying Lower Triassic Lingwen Fm.

Upper contact

The top marked by rhyolitic gravel-bearing crystal tuff lava shows an eruptive unconformable contact with the overlying Tangtadaling Fm consisting of andesitic lithic breccia lava.

Regional extent

The formation mainly occurs in the Liuluocun area of south Yanbei and in the Guling area of west Yanbei of Tonganling of the Hainan Island.


GeoJSON

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Fossils

None listed


Age 


Age Span: 

    Beginning stage: 
Aptian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
121.40

    Ending stage: 
Albian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
106.85

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao