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Laga Formation
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Laga Fm base reconstruction

Laga Fm

Period: 
Permian, Carboniferous

Age Interval: 
C2-P1 (48), Late Carboniferous to lower Cisuralian Epoch (Early Permian)


Province: 
Xizang (Tibet)

Type Locality and Naming

The type section is located on the southwestern slope of the Anji Mt., Shenza County, Tibet. It was named by Lin Baoyu in 1983.


Lithology and Thickness

Glacial. Grey medium-, and thick-bedded sandstone, pebble-bearing sandstone and fine-grained sandstone. Thickness is 605 m.


Lithology Pattern: 
Glacial till


Relationships and Distribution

Lower contact

Conformable contact with the underlying Yongzhu Fm (or maybe Sisuo Fm locally)

Upper contact

Overlain regionally by the Angjie Fm

Regional extent

Distributed in the Shenza area. It is concordant basically with the Pangduo Gr in the Lhasa region.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[89.41,29.18],[88.66,29.19],[88.08,29.24],[87.6,29.3],[86.75,29.35],[87.03,29.65],[86.95,29.9],[87.09,30.1],[86.99,30.43],[87.18,30.75],[87,31.16],[87.19,31.47],[87.07,31.75],[87.27,32],[87.45,32],[88.33,31.97],[88.91,31.97],[89.77,32.02],[89.62,31.75],[89.79,31.53],[89.64,31.23],[89.74,30.81],[89.55,30.48],[89.64,30.23],[89.47,30.04],[89.6,29.72],[89.38,29.55],[89.41,29.18]]]]}}

Fossils

Fairly abundant brachiopods represented in ascending order by the Rugoconcha-Choristites assemblage, the Dictyoclostus-Stepanoviella assemblage and the Neospirifer-Cyrtella assemblage


Age 

Zisongian Stage of the Early Permian Epoch (=Asselian-Sakmarian stages of Cisuralian Epoch (early Early Permian) and probably a portion of the Late Carboniferous Epoch, according to the Brachiopods. Shuzhong Shen et al (2019; Permian integrated stratigraphy and time scale) assign it to the upper Asselian through Sakmarian.

Age Span: 

    Beginning stage: 
Asselian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
296.21

    Ending stage: 
Sakmarian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
290.51

Depositional setting

It is interpreted as glacial-marine sediments.


Depositional pattern:  


Additional Information


Compiler:  

Wang Yujing

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