Grès supérieurs Formation

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.

Grès supérieurs Formation Stratigraphic range: Aptian-Albian ~120–100 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Unit of	Indosinias Group, equivalent with units of Khorat Group
Lithology
Primary	Sandstone, mudstone
Other	Siltstone
Location
Coordinates	17.0°N 106.0°E
Approximate paleocoordinates	18.0°N 112.6°E
Region	Savannakhet Province
Country	Laos
Extent	Savannakhet Basin
Type section
Named for	"Upper sandstone"
Grès supérieurs Formation (Laos)

Fossil content

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

Dinosaurs
Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Mandschurosaurus	M. laosensis				An indeterminate iguanodontian[1]
Tangvayosaurus	T. hoffeti			"[Two] partial postcranial skeletons."[2]	A sauropod[1]
Titanosaurus	T. falloti				An indeterminate sauropod possibly referable to Tangvayosaurus[1]
Ichthyovenator	I. laosensis			An incomplete skeleton[2]	A spinosaurid[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.

Other fossils

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

See also

• List of dinosaur-bearing rock formations

References

1. Weishampel et al., pp.563-570
2. "Table 13.1," in Weishampel et al., 2004, p.268

Bibliography

• 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

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