Nam Phong Formation | |
---|---|
Stratigraphic range:
Late Triassic-
Late Jurassic ~ | |
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′N 102°00′E / 16.3°N 102.0°E |
Approximate paleocoordinates | 20°54′S 93°00′E / 20.9°S 93.0°E |
Region | Isan |
Country | Thailand |
Extent | Khorat Plateau |
Type section | |
Named by | Ward & Bunnag |
Year defined | 1964 |
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]
Indeterminate prosauropod remains are present in Khon Kaen Province. [1]
Vertebrates of the Nam Phong Formation | ||||||
---|---|---|---|---|---|---|
Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
Isanosaurus [1] | I. attavipachi [1] | Khon Kaen Province [1] | "Associated fragmentary vertebrae, ribs, chevrons, scapula, sternal, femur." [2] |
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]
Nam Phong Formation | |
---|---|
Stratigraphic range:
Late Triassic-
Late Jurassic ~ | |
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′N 102°00′E / 16.3°N 102.0°E |
Approximate paleocoordinates | 20°54′S 93°00′E / 20.9°S 93.0°E |
Region | Isan |
Country | Thailand |
Extent | Khorat Plateau |
Type section | |
Named by | Ward & Bunnag |
Year defined | 1964 |
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]
Indeterminate prosauropod remains are present in Khon Kaen Province. [1]
Vertebrates of the Nam Phong Formation | ||||||
---|---|---|---|---|---|---|
Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
Isanosaurus [1] | I. attavipachi [1] | Khon Kaen Province [1] | "Associated fragmentary vertebrae, ribs, chevrons, scapula, sternal, femur." [2] |
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]