Nam Phong Formation

Nam Phong Formation Stratigraphic range: Upper Triassic
Type	Geological formation
Unit of	Khorat Group
Underlies	Phu Kradung Fm
Overlies	Indosinian II Uncomformity
Lithology
Primary	Sandstones
Other	Conglomerates, Siltstones
Location
Region	Khorat Plateau Basin
Country	Thailand

The Nam Phong Formation is the basal unit of the Khorat Group. It consists of resistant, red-brown micaceous sandstones, conglomerates, siltstone and mudstone 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 redish 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 Changwat Khon Kaen, Thailand. It is of Norian to Rhaetian age (Upper Triassic) to (Lower Jurrasic) age, and is notable for its fossils of early dinosaurs.^[1]

Vertebrate fauna

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

Color key Taxon Reclassified taxon Taxon falsely reported as present Discredited taxon Ichnotaxon Ootaxon Morphotaxon		Notes Uncertain or tentative data are in small text; crossed out data 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]

See also

• List of dinosaur-bearing rock formations

References

1. ^ ^{a b c d e} Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Triassic, Asia)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 525–527. ISBN 0-520-24209-2.
2. ^ "Table 13.1," in Weishampel, et al. (2004). Page 261.