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-Valanginian
~145–133.6 Ma
TypeGeological formation
Unit ofKhorat Group
UnderliesSao Khua Formation
OverliesPhu Kradung Formation
Thickness150 m (490 ft)
Lithology
PrimarySandstone
OtherSiltstone, mudstone, conglomerate
Location
Coordinates16°06′N 103°54′E / 16.1°N 103.9°E / 16.1; 103.9
Approximate paleocoordinates14°18′N 111°24′E / 14.3°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 is located in Thailand
Phra Wihan Formation
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-Valanginian in age based on palynological analysis.[1][2][3]

Sauropod (fossil) tracks have been recorded from this formation.[4]

See also

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References

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  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. ^ Tucker, Ryan T.; Hyland, Ethan G.; Gates, Terry A.; King, M. Ryan; Roberts, Eric M.; Foley, Elliot K.; Berndt, David; Hanta, Rattanaphorn; Khansubha, Sasa-on; Aswasereelert, Wasinee; Zanno, Lindsay E. (September 2022). "Age, depositional history, and paleoclimatic setting of Early Cretaceous dinosaur assemblages from the Sao Khua Formation (Khorat Group), Thailand". Palaeogeography, Palaeoclimatology, Palaeoecology. 601: 111107. Bibcode:2022PPP...60111107T. doi:10.1016/j.palaeo.2022.111107. ISSN 0031-0182.
  4. ^ Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.

Bibliography

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