Phra Wihan Formation

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

Phra Wihan Formation
Stratigraphic range: Berriasian-Barremian
~145–125 Ma
TypeGeological formation
Unit ofKhorat Group
UnderliesSao Khua Formation
OverliesPhu Kradung Formation
Thickness150 m (490 ft)
Lithology
PrimarySandstone
OtherSiltstone, mudstone, conglomerate
Location
Coordinates16.1°N 103.9°E / 16.1; 103.9
Approximate paleocoordinates14.3°N 111.4°E / 14.3; 111.4
RegionNortheast Thailand (Khorat Basin)
Country Thailand
ExtentKhorat Plateau
Type section
Named forKhao Phra Wihan, an 11th-century Khmer Temple (Khao Phra Wihan National Park)
Named byWard & Bunnag
Year defined1964
Phra Wihan Formation (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 palynological analysis.[1][2]

Sauropod (fossil) tracks have been recorded from this formation.[3]

See also

References

  1. Suteetorn and Jarnyahran (1986). "Geological Map of Thailand." Sheet NE 48-14 1:250,000.
  2. Racey and Goodall (2009). "Late Palaeozoic and Mesozoic Ecosystems in SE Asia". Geological Society. London. Special Publication 315 Pp 69-84.
  3. Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.

Bibliography

  • Weishampel, David B.; Peter Dodson, and Halszka Osmólska (eds.). 2004. The Dinosauria, 2nd edition, 1–880. Berkeley: University of California Press. Accessed 2019-02-21. ISBN 0-520-24209-2
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