Neha Patil (Editor)

Phra Wihan Formation

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Type
  
Geological formation

Thickness
  
~150m

Country
  
Thailand

Overlies
  
Phu Kradung Formation

Unit of
  
Korat Group

Other
  
Shale

Primary
  
Sandstone

Underlies
  
Sao Khua Formation

Region
  
Northeast Thailand (Khorat Basin)

The Early Cretaceous Phra Wihan Formation is the second lowest member of the Mesozoic Korat Group which outcrops in Northeast Thailand.

Comprises fine- to coarse-grained sheet and channelled sandstone beds and rarer variegated siltstone and mudstone. Intermittent conglomerate beds.

Deposited in a fluvial environment dominated by high-energy, shallow braided rivers with subordinate lower energy meandering river systems and associated flood plains.

The Phra Wihan Formation is considered to be Berriasian-Barremian in age based on recent palynology evidence.

Sauropod (fossil) tracks have been recorded from this formation.

References

Phra Wihan Formation Wikipedia