Grès supérieurs Formation explained

Grès supérieurs Formation
Type:	Geological formation
Age:	Aptian-Albian ~
Period:	Albian
Prilithology:	Sandstone, mudstone
Otherlithology:	Siltstone
Namedfor:	"Upper sandstone"
Region:	Savannakhet Province
Coordinates:	17°N 106°W
Paleocoordinates:	18°N 112.6°W
Unitof:	Indosinias Group, equivalent with units of Khorat Group
Extent:	Savannakhet Basin

The Grès supérieurs Formation (French for "Upper sandstone") is a geological formation in Laos whose strata date back to the Aptian to Albian stages of the Early Cretaceous. Dinosaur remains are among the fossils that have been recovered from the formation.^[1] It is equivalent to the Khok Kruat Formation of Thailand.

Fossil content

The Grès supérieurs Formation has also yielded remains of indeterminate iguanodontians, as well as ornithopod and sauropod tracks.

Dinosaurs

Dinosaurs
Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Mandschurosaurus	M. laosensis				An indeterminate iguanodontian
Tangvayosaurus	T. hoffeti			"[Two] partial postcranial skeletons."^[3]	A sauropod
Titanosaurus	T. falloti				An indeterminate sauropod possibly referable to Tangvayosaurus
Ichthyovenator	I. laosensis			An incomplete skeleton	A spinosaurid

Other fossils

• Sauropod tracks^[1]
• Iguanodontia indet (=Mandschurosaurus laosensis)^[1]
• Euornithopod tracks^[1]

See also

• List of dinosaur-bearing rock formations

References

Bibliography

Further reading

• R. Allain, T. Xaisanavong, P. Richir and B. Khentavong. 2012. The first definitive Asian spinosaurid (Dinosauria: Theropoda) from the early cretaceous of Laos. Naturwissenschaften 99:369-377
• F. de Lapparent de Broin. 2004. A new Shachemydinae (Chelonii, Cryptodira) from the Lower Cretaceous of Laos: preliminary data. Comptes Rendus Palevol 3:387-396
• R. Allain, P. Taquet, B. Battail, J. Dejax, P. Richir, M. Véran, F. Limon-Duparcmeur, R. Vacant, O. Mateus, P. Sayarath, B. Khenthavong and S. Phouyavong. 1999. Un nouveau genre de dinosaure sauropode de la formation des Grès supérieurs (Aptien-Albien) du Laos [A new genus of sauropod dinosaur from the Grès supérieurs Formation (Aptian-Albian) of Laos]. Comptes Rendus de l'Académie des Sciences à Paris, Sciences de la Terre et des Planètes 329:609-616
• J.-H. Hoffet. 1942. Description de quelques ossements de Titanosauriens du Sénonien du Bas-Laos [Description of some titanosaurian bones from the Senonian of Lower Laos]. Comptes Rendus des Séances du Conseil des Recherches Scientifiques de l'Indochine 1942(1):49-57
• J.-H. Hoffett. 1936. Découverte du Crétacé en Indochine [Discovery of the Cretaceous in Indochina]. Comptes Rendus Hebdomadaires des Seances de l'Académie des Sciences 202:1867-1869

Notes and References

1. Weishampel et al., pp.563-570
2. Cavin . L. . Deesri . U. . Veran . M. . Khentavong . B. . Jintasakul . P. . Chanthasit . P. . Allain . R. . A new Lepisosteiformes (Actinopterygii: Ginglymodi) from the Early Cretaceous of Laos and Thailand, SE Asia . Journal of Systematic Palaeontology . 2019 . 17 . 5 . 393–407 . 10.1080/14772019.2018.1426060.
3. "Table 13.1," in Weishampel et al., 2004, p.268