The Los Alamitos Formation is a geological formation of the North Patagonian Massif in Rio Negro Province, northwestern Patagonia, Argentina, whose strata date back to the Late Cretaceous (Late Campanian to Maastrichtian). Dinosaur remains are among the fossils that have been recovered from the formation.[1]
| Los Alamitos Formation | |
|---|---|
| Stratigraphic range: Late Campanian-Maastrichtian ~ | |
| Type | Geological formation |
| Sub-units | Coli Toro Member |
| Lithology | |
| Primary | Siltstone |
| Other | Sandstone |
| Location | |
| Coordinates | 42°06′S 66°18′W / 42.1°S 66.3°W |
| Approximate paleocoordinates | 45°00′S 52°18′W / 45.0°S 52.3°W |
| Region | Río Negro Province |
| Country | Argentina |
| Extent | North Patagonian Massif |
  Los Alamitos Formation (Argentina) | |
Fossil content
edit
Dinosaurs
edit| Genus | Species | Material | Notes | Images |
|---|---|---|---|---|
| Aeolosaurus | A. rionegrinus | A titanosaur. |  | |
| Alamitornis | A. minutus | An ornithuromorph. | ||
| Huallasaurus | H. australis | "Partial skulls with associated postcrania, approximately [five] individuals." | A hadrosaur formally named "Kritosaurus" australis. |  |
| cf. Hesperornithes | ||||
| Indeterminate theropod | ||||
| Indeterminate ornithurine | ||||
| Indeterminate avian |
Rhynchocephalians
edit| Genus | Species | Material | Notes | Images |
|---|---|---|---|---|
| Alamitosphenos | A. mineri | |||
| Kawasphenodon | K. expectatus |
Snakes
edit| Genus | Species | Material | Notes | Imaes |
|---|---|---|---|---|
| Alamitophis | A. elongatus |
Mammaliaforms
edit| Genus | Species | Material | Notes | Images |
|---|---|---|---|---|
| Alamitherium | A. bishopi | |||
| Austrotriconodon | A. sepulvedai | |||
| A. mckennai | ||||
| Leonardus | L. cuspidatus | |||
| Bondesius | B. ferox | |||
| Brandonia | B. intermedia | |||
| Casamiquelia | C. rionegrina | |||
| Ferugliotherium | F. windhauseni | |||
| Gondwanatherium | G. patagonicum | |||
| Groebertherium | G. novasi | |||
| Mesungulatum | M. houssayi | |||
| Paraungulatum | P. rectangularis | |||
| Reigitherium | R. bunodontum | |||
| Rougiertherium | R. tricuspes |
See also
editReferences
edit- ^ Weishampel et al., 2004, "Dinosaur distribution (Late Cretaceous, South America).", pp.600-604
- ^ Rozadilla, Sebastián; Brissón-Egli, Federico; Lisandro Agnolín, Federico; Aranciaga-Rolando, Alexis Mauro; Novas, Fernando Emilio (2022). "A new hadrosaurid (Dinosauria: Ornithischia) from the Late Cretaceous of northern Patagonia and the radiation of South American hadrosaurids". Journal of Systematic Palaeontology. 19 (17): 1207–1235. doi:10.1080/14772019.2021.2020917. S2CID 247122005.
- ^ Prieto–Marquez, Alberto; Salinas, Guillermo C. (2010). "A re–evaluation of Secernosaurus koerneri and Kritosaurus australis (Dinosauria, Hadrosauridae) from the Late Cretaceous of Argentina". Journal of Vertebrate Paleontology. 30 (3): 813–837. Bibcode:2010JVPal..30..813P. doi:10.1080/02724631003763508. S2CID 85814033.
- ^ "Table 20.1," in Weishampel, et al.
- ^ Agnolín, F. L.; Aranciaga Rolando, A. M.; Chimento, N. R.; Novas, F. E. (2023). "New small reptile remains from the Late Cretaceous of Patagonia increase morphological diversity of sphenodontids (Lepidosauria)". Proceedings of the Geologists' Association. 135: 36–44. doi:10.1016/j.pgeola.2023.09.007.
- ^ Apesteguía, Sebastián (2005-12-01). "A Late Campanian sphenodontid (Reptilia, Diapsida) from northern Patagonia". Comptes Rendus Palevol. 4 (8): 663–669. Bibcode:2005CRPal...4..663A. doi:10.1016/j.crpv.2005.06.003. ISSN 1631-0683.
- ^ Bonaparte, 1999
- ^ Bonaparte & Soria, 1985
- ^ Bonaparte, 1990
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