Nam Phong Formation

The Nam Phong Formation, which correlates to the Indosinian III Unconformity, is a geological formation in Thailand. It underlies the Khorat Group. It consists of resistant, red-brown micaceous sandstones, conglomerates, siltstones and mudstones of mainly fluvial origin. The sandstones are medium to very fine-grained and are usually calcareous. The conglomerates contain pebbles of quartz, brown and grey chert, and reddish brown siltstone. Cross bedding and plane-bed stratification are common in the sandstones and conglomerates. The sandstones and conglomerates make up approximately 30% of the formation. This sedimentary rock formation is found in Khon Kaen Province, Thailand. It is of Norian to Rhaetian age (Upper Triassic) to (Lower Jurassic) age, and is notable for its fossils of early dinosaurs.[1]

Nam Phong Formation
Stratigraphic range: Late Triassic-Late Jurassic
TypeGeological formation
UnderliesPhu Kradung Formation
OverliesIndosinian II Unconformity
Thickness1,465 m (4,806 ft)
Lithology
PrimarySandstone
OtherConglomerate, siltstone, mudstone
Location
Coordinates16.3°N 102.0°E / 16.3; 102.0
Approximate paleocoordinates20.9°S 93.0°E / -20.9; 93.0
RegionIsan
Country Thailand
ExtentKhorat Plateau
Type section
Named byWard and Bunnag
Year defined1964
Nam Phong Formation (Thailand)

Vertebrate fauna

Indeterminate prosauropod remains are present in Khon Kaen Province.[1]

Color key
Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
 Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.
Vertebrates reported from the Nam Phong Formation
Genus Species Location Stratigraphic position Material Notes Images

Isanosaurus[1]

I. attavipachi[1]

Geographically present in Khon Kaen Province.[1]

"Associated fragmentary vertebrae, ribs, chevrons, scapula, sternal, femur."[2]

Correlations

The formation has been correlated with the Lower Elliot Formation (Karoo Basin) and Forest Sandstone of Africa, the Caturrita Formation of the Paraná Basin in Brazil, the Laguna Colorada and Los Colorados Formations (Ischigualasto-Villa Unión Basin) of Argentina, the Chinle Formation of North America, the Trössingen Formation of the Keuper Group of Germany, and the Lower Dharmaram Formation of India.[3]

See also
  • List of dinosaur-bearing rock formations

References
  1. Weishampel et al., 2004, pp.525–527
  2. "Table 13.1," in Weishampel et al., 2004, p.261
  3. Novas et al., 2011, p.343

Bibliography
  • Novas, Fernando E.; Martín D. Ezcurra; Sankar Chatterjee, and T.S. Kutty. 2011. New dinosaur species from the Upper Triassic Upper Maleri and Lower Dharmaram formations of central India. Earth and Environmental Science Transactions of the Royal Society of Edinburgh 101. 333–349. Accessed 2019-04-06.doi:10.1017/S1755691011020093
  • Weishampel, David B.; Peter Dodson, and Halszka Osmólska (eds.). 2004. The Dinosauria, 2nd edition, 1–880. Berkeley: University of California Press. Accessed 2019-02-21.ISBN 0-520-24209-2


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