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 | |
|---|---|
| Type | Geological formation |
| Unit of | Khorat Group |
| Underlies | Sao Khua Formation |
| Overlies | Phu Kradung Formation |
| Thickness | 150 m (490 ft) |
| Lithology | |
| Primary | Sandstone |
| Other | Siltstone, mudstone, conglomerate |
| Location | |
| Coordinates | 16.1°N 103.9°E |
| Approximate paleocoordinates | 14.3°N 111.4°E |
| Region | Northeast Thailand (Khorat Basin) |
| Country |  |
| Extent | Korat Plateau |
| Type section | |
| Named for | Named after Khao Phra Wihan, an 11th-century Khmer Temple in the area, where this Formation is well exposed. (See, Khao Phra Wihan National Park) |
| Named by | Ward and Bunnag |
| Year defined | 1964 |
  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 recent palynology evidence.[1][2]
Sauropod (fossil) tracks have been recorded from this formation.[3]
See also
- List of dinosaur-bearing rock formations
Footnotes
- Suteetorn and Jarnyahran (1986). "Geological Map of Thailand." Sheet NE 48-14 1:250,000.
- Racey and Goodall (2009). "Late Palaeozoic and Mesozoic Ecosystems in SE Asia". Geological Society. London. Special Publication 315 Pp 69-84.
- Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.
References
- Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. ISBN 0-520-24209-2.
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