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Phu Kradung Formation

The Early Cretaceous Phu Kradung Formation is the lowest member of the Mesozoic Khorat Group which outcrops on the Khorat Plateau in Isan, Thailand. This geological formation consists of micaceous, brown to reddish-brown siltstone beds with minor brown and grey shale and sandstone beds. Occasional lime-noduled conglomerate occurs.[1]

Phu Kradung Formation
Stratigraphic range: Berriasian
Type Geological formation
Unit of Khorat Group
Underlies Phra Wihan Formation
Overlies Nam Phong Formation
Primary Siltstone and Mudstone
Other Sandstone
Region Isan
Country Thailand
Extent Korat Plateau

The Phu Kradung Formation sediments were deposited in a lake-dominated floodplain cut by meandering and occasionally braided river channels.[2]

The Phu Kradung Formation is considered, on the basis of recent vertebrae fossil discoveries, to be Late Jurassic in age. However, new palynology data suggests an age of Early Cretaceous.[2]

Dinosaur remains have been recovered from this formation, although none have yet been referred to a specific genus.[3]

Chalawan, an extinct genus of pholidosaurid mesoeucrocodylian, is currently known solely from its holotype, a nearly complete mandible collected in the early 1980s from a road-cut near the town of Nong Bua Lamphu in the upper part of the Phu Kradung Formation. This single specimen is the most well preserved vertebrate fossil that has been found from the formation. It contains a single species, Chalawan thailandicus.[4]

See alsoEdit


  1. ^ Suteetorn and Jarnyahran (1986). "Geological Map of Thailand 1:250,000, Sheet NE 48-14 (Roi Et).
  2. ^ a b 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.
  4. ^ Martin, J. E.; Lauprasert, K.; Buffetaut, E.; Liard, R.; Suteethorn, V. (2013). Angielczyk, Kenneth, ed. "A large pholidosaurid in the Phu Kradung Formation of north-eastern Thailand". Palaeontology. 57: 757–769. doi:10.1111/pala.12086. 


  • Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. ISBN 0-520-24209-2.