Phra Wihan Formation

Phra Wihan Formation
Stratigraphic range: Berriasian-Valanginian ~145–133.6  Ma PreꞒ Ꞓ O S D C P T J K Pg N
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°06′N103°54′E / 16.1°N 103.9°E / 16.1; 103.9
Approximate paleocoordinates	14°18′N111°24′E / 14.3°N 111.4°E / 14.3; 111.4
Region	Northeast Thailand (Khorat Basin)
Country	Thailand
Extent	Khorat Plateau
Type section
Named for	Phra Wihan, an 11th-century Khmer Temple
Named by	Ward & Bunnag
Year defined	1964
Phra Wihan Formation (Thailand)

The Early Cretaceous Phra Wihan Formation is the second lowest member of the Mesozoic Khorat 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-Valanginian in age based on palynological analysis. ^{[1] [2] [3]}

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

See also

• List of dinosaur-bearing rock formations
  • List of stratigraphic units with sauropodomorph tracks
    • Sauropod tracks

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. 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

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