Stratigraphic range: Late Jurassic-Early Cretaceous ~Tithonian–Berriasian
PreꞒ
Ꞓ
O
S
D
C
P
T
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K
Pg
N
Paleoenvironment of the Phu Kradung Formation
Type
Geological formation
Unit of
Khorat Group
Underlies
Phra Wihan Formation
Overlies
Nam Phong Formation
Lithology
Primary
Siltstone, mudstone
Other
Sandstone
Location
Coordinates
17°12′N102°24′E / 17.2°N 102.4°E / 17.2; 102.4
Approximate paleocoordinates
14°42′N108°30′E / 14.7°N 108.5°E / 14.7; 108.5
Region
Isan
Country
Thailand
Extent
Khorat Plateau
Type section
Named by
Ward & Bunnag
Year defined
1964
Phu Kradung Formation (Thailand)
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]
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 and biostratigraphic data suggests an age of Early Cretaceous for the upper section.[2][3]
Dinosaur remains have been recovered from this formation, although none have yet been referred to a specific genus.[4][5]
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.[6]
^Suteetorn and Jarnyahran (1986). "Geological Map of Thailand 1:250,000, Sheet NE 48-14 (Roi Et).
^ abRacey and Goodall (2009). "Late Palaeozoic and Mesozoic Ecosystems in SE Asia". Geological Society. London. Special Publication 315 Pp 69-84.
^Tong, Haiyan; Chanthasit, Phornphen; Naksri, Wilailuck; Ditbanjong, Pitaksit; Suteethorn, Suravech; Buffetaut, Eric; Suteethorn, Varavudh; Wongko, Kamonlak; Deesri, Uthumporn; Claude, Julien (December 2021). "Yakemys multiporcata n. g. n. sp., a Large Macrobaenid Turtle from the Basal Cretaceous of Thailand, with a Review of the Turtle Fauna from the Phu Kradung Formation and Its Stratigraphical Implications". Diversity. 13 (12): 630. doi:10.3390/d13120630. ISSN 1424-2818.
^Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.
^Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. ISBN 0-520-24209-2.
^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 (4): 757–769. doi:10.1111/pala.12086. S2CID 128482290.
and 29 Related for: Phu Kradung Formation information
The Early Cretaceous PhuKradungFormation is the lowest member of the Mesozoic Khorat Group which outcrops on the Khorat Plateau in Isan, Thailand. This...
early-1980s from a road-cut near the town of Nong Bua Lam Phu, in the upper part of the PhuKradungFormation. This single specimen is the most well preserved...
genus of basal neornithischian dinosaur from the Late Jurassic PhuKradungFormation of Thailand. The type species is Minimocursor phunoiensis. The holotype...
probable basal tyrannosauroid are described from the Upper Jurassic PhuKradungFormation (Thailand) by Chowchuvech et al. (2024). Xing et al. (2024) describe...
the Itat Formation in Russia suggest they also reached Siberia. Additionally, an indeterminate cervical vertebra from the PhuKradungFormation of Thailand...
potamosiamensis and I. kalasinensis, both recovered from the lower PhuKradungFormation. It is unique among teleosauroids as it is the only named genus...
species Basilochelys macrobios, its fossils have been found in the PhuKradungFormation of Northeast Thailand. It is considered to be the most basal member...
found from the formation; other vertebrates, including dinosaurs, are known only from fragmentary remains. The age of the PhuKradungFormation is uncertain...
Cretaceous of Thailand, with a Review of the Turtle Fauna from the PhuKradungFormation and Its Stratigraphical Implications". Diversity. 13 (12): 630....
(2024) describe egg capsules of Palaeoxyris sp. from the Jurassic PhuKradungFormation (Thailand), interpreted as indicating that at least some hybodont...
Kruat Formations had a more semi-arid climate than the older, more humid PhuKradungFormation, dated to the Berriasian. The Khok Kruat Formation is composed...
Buffetaut, Eric (2023). "A New Basal Neornithischian Dinosaur from the PhuKradungFormation (Upper Jurassic) of Northeastern Thailand". Diversity. 15 (7): 851...
Buffetaut, Eric (2023). "A New Basal Neornithischian Dinosaur from the PhuKradungFormation (Upper Jurassic) of Northeastern Thailand". Diversity. 15 (7): 851...
ankylosaurian dinosaur Bienosaurus lufengensis from the Lower Lufeng Formation of Yunnan, China". Acta Palaeontologica Polonica 64 Alifanov, V. R.; Saveliev...
"A new primitive eucryptodiran turtle from the Upper Jurassic PhuKradungFormation of the Khorat Plateau, NE Thailand". Geological Magazine. 152 (1):...
(2013). Angielczyk, Kenneth (ed.). "A large pholidosaurid in the PhuKradungFormation of north-eastern Thailand". Palaeontology. 57 (4): 757–769. doi:10...
the Late Jurassic-Early Cretaceous (Tithonian-Valanginian?) lower PhuKradungFormation of Thailand. It is monotypic, containing a single species, Yakemys...
Liard, R. & Suteethorn, V. (2013). "A large pholidosaurid in the PhuKradungFormation of north-eastern Thailand". Palaeontology. 57 (4): 757–769. doi:10...
dinosaur known from a single dorsal vertebra found in Thailand's PhuKradungFormation. The type species, "Siamodracon altispinax", was named by Ulansky...
fish Isanichthys (Actinopterygii, Holostei) from the Late Jurassic PhuKradungFormation, northeastern Thailand". Acta Palaeontologica Polonica. 59 (2):...
Cretaceous of Thailand, with a Review of the Turtle Fauna from the PhuKradungFormation and Its Stratigraphical Implications". Diversity. 13 (12): 630....
believed it to be the bell of Indra. Phu Kradueng mountain, made up of Jurassic and Cretaceous sandstone formations, takes the form of a mesa towering some...
Romain; Suteethorn, Varavudh (2014). "A large pholidosaurid in the PhuKradungFormation of north-eastern Thailand". Palaeontology. 57 (4): 757–69. doi:10...
macrobios n. gen. and n. sp., a large cryptodiran turtle from the PhuKradungFormation (latest Jurassic-earliest Cretaceous) of the Khorat Plateau, NE...
(2014). A description of abelisaurid teeth from the Late Jurassic Lourinhã Formation of Portugal and a phylogenetic analysis of theropod relationships based...
Aptian. It overlies the Nam Phong Formation and is overlain by the evaporitic deposits of the Maha Sarakham Formation. It consists of continental freshwater...
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