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Yongle Formation

Yongle Fm

Period: 
Neogene

Age Interval: 
late Pliocene-early Pleistocene, N2-Q, (37)


Province: 
South China Sea

Type Locality and Naming

South China Sea – Xisha islands. The type section is located at Xishen Hole No.1, Xishui Well No.1 in Yongxing Island, Xisha Islands ("Paracel Islands"). It was named and surveyed by Zhang M., Jin Q. et al. in 1992.

NOTE: There is not a standardized regional lithostratigraphy for the Xisha islands; nor for the nomenclature in the reference wells.

Synonym: Yinggehai Fm ?


Lithology and Thickness

It is characterized by the gray and white dolomitized compact wackestone, packstone and algal oncolites. Foraminifera and algal fossils are yielded. The thickness is 290 m.


Lithology Pattern: 
Reef limestone


Relationships and Distribution

Lower contact

It contacts to underlying Xuande Fm with erosional level.

Upper contact

It contacts to overlying Yongxing Fm with erosional level.

Regional extent

It is distributed in Xisha Islands ("Paracel Islands")


GeoJSON

null

Fossils

Globoquadrina altispira, Globigerinoides trilobus, Amphistegina radiata.


Age 

Pliocene-earliest Pleistocene if equivalent to Yinggehai Fm.

Age Span: 

    Beginning stage: 
Zanclean

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
5.34

    Ending stage: 
Piacenzian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
2.58

Depositional setting

It is interpreted as an atoll lagoon environment.


Depositional pattern:  


Additional Information


Compiler:  

Tao Deng, Sukuan Hou, J.Z. Qigao, Q. Li, Q.Q. Shi, B.Y. Sun, S.Q. Wang, F.X. Wu