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 ~ | |
| 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 |
| Approximate paleocoordinates | 18°00′N 112°36′E / 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
editThe Grès supérieurs Formation has also yielded remains of indeterminate iguanodontians, as well as ornithopod and sauropod tracks.
Fish
edit| Fish | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Lanxangichthys | L. alticephalus | A three-dimensionally preserved skull | A basal lepisosteiform[2] | |||
Dinosaurs
edit| Dinosaurs | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Mandschurosaurus | M. laosensis | An indeterminate iguanodontian[1] | ||||
| Tangvayosaurus | T. hoffeti | "[Two] partial postcranial skeletons."[3] | A sauropod[1] |  | ||
| Titanosaurus | T. falloti | An indeterminate sauropod possibly referable to Tangvayosaurus[1] | ||||
| Ichthyovenator | I. laosensis | An incomplete skeleton[3] | A spinosaurid[1] |  | ||
Color key
|
Notes Uncertain or tentative taxa are in small text; |
- Other fossils
See also
editReferences
edit- ^ a b c d e f g h 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.
- ^ a b "Table 13.1," in Weishampel et al., 2004, p.268
Bibliography
edit- 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
Further reading
edit- 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