Stratigraphic range: Late Triassic-Late Jurassic ~220–160 Ma
PreꞒ
Ꞓ
O
S
D
C
P
T
J
K
Pg
N
Type
Geological formation
Underlies
Phu Kradung Formation
Overlies
Indosinian II Unconformity
Thickness
1,465 m (4,806 ft)
Lithology
Primary
Sandstone
Other
Conglomerate, siltstone, mudstone
Location
Coordinates
16°18′N102°00′E / 16.3°N 102.0°E / 16.3; 102.0
Approximate paleocoordinates
20°54′S93°00′E / 20.9°S 93.0°E / -20.9; 93.0
Region
Isan
Country
Thailand
Extent
Khorat Plateau
Type section
Named by
Ward & Bunnag
Year defined
1964
Nam Phong Formation (Thailand)
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]
^Weishampel et al., 2004, pp.525–527
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