Gres superieurs Formation

Grès supérieurs Formation
Stratigraphic range: Aptian-Albian ~
Type	Geological formation
Unit of	Indosinias Group, equivalent with units of Khorat Group
Lithology
Primary	Sandstone, mudstone
Other	Siltstone
Location
Coordinates	17°00′N 106°00′E / 17.0°N 106.0°E / 17.0; 106.0
Approximate paleocoordinates	18°00′N 112°36′E / 18.0°N 112.6°E / 18.0; 112.6
Region	Savannakhet Province
Country	Laos
Extent	Savannakhet Basin
Type section
Named for	"Upper sandstone"
Grès supérieurs Formation (Laos)

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.

Fish

Fish
Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Lanxangichthys	L. alticephalus			A three-dimensionally preserved skull	A basal lepisosteiform^[2]

Turtle

Turtle
Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Shachemys	S. laosiana			Carapaces, scapula and partial humerus, skull	An adochid^[3]

Dinosaurs

Dinosaurs
Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Euhelopodidae Indet.^[4]	Indeterminate
Mandschurosaurus	M. laosensis				An indeterminate iguanodontian^[1]
Tangvayosaurus	T. hoffeti			"[Two] partial postcranial skeletons."^[5]	A sauropod^[1]
Titanosaurus	T. falloti				An indeterminate sauropod possibly referable to Tangvayosaurus^[1]
Ichthyovenator	I. laosensis			An incomplete skeleton^[5]	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]

References

Weishampel et al., pp.563-570
Cavin, L.; Deesri, U.; Veran, M.; Khentavong, B.; Jintasakul, P.; Chanthasit, P.; Allain, R. (2019). "A new Lepisosteiformes (Actinopterygii: Ginglymodi) from the Early Cretaceous of Laos and Thailand, SE Asia". Journal of Systematic Palaeontology. 17 (5): 393–407. doi:10.1080/14772019.2018.1426060.
de Lapparent de Broin, France (2004-09-01). "A new Shachemydinae (Chelonii, Cryptodira) from the Lower Cretaceous of Laos: preliminary data". Comptes Rendus Palevol. 3 (5): 387–396. doi:10.1016/j.crpv.2004.05.004. ISSN 1631-0683.
Lim, V.; Buffetaut, E.; Tong, H.; Cavin, L.; Pann, K.; Ngoeun, P. P. (2023). "The First Dinosaur from the Kingdom of Cambodia: A Sauropod Fibula from the Lower Cretaceous of Koh Kong Province, South-Western Cambodia". Fossils. 1 (1): 49–59. doi:10.3390/fossils1010006.
"Table 13.1," in Weishampel et al., 2004, p.268

Bibliography

Weishampel, David B.; Dodson, Peter; Osmólska, Halszka (2004), The Dinosauria, 2nd edition, Berkeley: University of California Press, pp. 1–880, ISBN 0-520-24209-2, retrieved 2019-02-21{{citation}}: CS1 maint: publisher location (link)