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: Early Cretaceous
~?Berriasian
TypeGeological formation
Unit ofKhorat Group
UnderliesPhra Wihan Formation
OverliesNam Phong Formation
Lithology
PrimarySiltstone, mudstone
OtherSandstone
Location
Coordinates17.2°N 102.4°E / 17.2; 102.4
Approximate paleocoordinates14.7°N 108.5°E / 14.7; 108.5
RegionIsan
Country Thailand
ExtentKhorat Plateau
Type section
Named byWard & Bunnag
Year defined1964
Phu Kradung Formation (Thailand)

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][4]

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.[5]

Vertebrate paleofauna
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See also

References
  1. Suteetorn and Jarnyahran (1986). "Geological Map of Thailand 1:250,000, Sheet NE 48-14 (Roi Et).
  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.
  4. Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. ISBN 0-520-24209-2.
  5. 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.
  6. Tong, H.; Claude, J.; Naksri, W.; Suteethorn, V.; Buffetaut, E.; Khansubha, S.; Wongko, K. & Yuangdetkla, P. 2009. Basilochelys macrobios n. gen. and n. sp., a large cryptodiran turtle from the Phu Kradung Formation (latest Jurassic-earliest Cretaceous) of the Khorat Plateau, NE Thailand Archived July 5, 2009, at the Wayback Machine. In: Buffetaut, E.; Cuny, G.; Le Loeuff, J. & Suteethorn, V. (eds.). Late Palaeozoic and Mesozoic Ecosystems in SE Asia. Geological Society, London, Special Publications 315: 229-243.
  7. Martin, Jeremy E.; Suteethorn, S.; Lauprasert, K. (February 2019). "A new freshwater teleosaurid from the Jurassic of northeastern Thailand". Journal of Vertebrate Paleontology. 64 (2): 239–260. doi:10.1080/02724634.2018.1549059.
  8. Suteethorn, S., Le Loeuff, J., Buffetaut, E., Suteethorn, V., and Wongko, K. 2013. First evidence of a mamenchisaurid dinosaur from the Upper Jurassic–Lower Cretaceous Phu Kradung Formation of Thailand. Acta Palaeontologica Polonica 58 (3): 459–469.
  9. Ulansky, R. E., 2014. Evolution of the stegosaurs (Dinosauria; Ornithischia). Dinologia, 35 pp. [in Russian]. PDF.
  10. Peter M. Galton; Kenneth Carpenter (2016). "The plated dinosaur Stegosaurus longispinus Gilmore, 1914 (Dinosauria: Ornithischia; Upper Jurassic, western USA), type species of Alcovasaurus n. gen". Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen. 279 (2): 185–208. doi:10.1127/njgpa/2016/0551.
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