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Lasaila Limestone Formation
Click to display on map of the Ancient World at:
Lasaila Limestone Fm base reconstruction

Lasaila Limestone Fm

Period: 
Permian

Age Interval: 
P (51), Guadalupian Epoch (Middle Permian)


Province: 
Xizang (Tibet)

Type Locality and Naming

The type section is located at Lasaila 50 km to the southwest of the Zhongba County, Tibet. It was named by Wu Haoruo in 1984.


Lithology and Thickness

Limestone. Exotic block of grey-white crystalline limestone, breccia, siliceous rocks and red limestone. Thickness is over 100 m


Lithology Pattern: 
Limestone


Relationships and Distribution

Lower contact

Unknown, because it is overthrusting upon the Jurassic-Cretaceous sandstones and shales. Next older regional unit might be Jiala Fm

Upper contact

Unknown. Possible next-younger regional unit (or partly coeval) is the Langcuo Fm

Regional extent

This is an exotic block found only in the Lasaila area.


GeoJSON

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Fossils

Yields abundant fossils including Fusulinida represented by Reichelina, Dunbarula, Yangchienia, Chusenella, Schwagerina, Lantschichites and Neoschwagerina; Brachiopods such as Leptodus, Richthofenia, Chonetella, Asioproductus, Cancrinella, Waagenoconcha, Spiriferella and Neospirifer; Corals such as Tachylasma, Wentzelella, etc.


Age 

Maokouan Subepoch = Guadalupian Epoch (Middle Permian)

Age Span: 

    Beginning stage: 
Roadian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
274.37

    Ending stage: 
Wordian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
264.34

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wang Yujing

GeoJSON estimate by Longgang Ye and Yuyin Li (Chengdu Univ. Tech. students)