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
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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