Earth:Los Alamitos Formation
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| Los Alamitos Formation Stratigraphic range: Late Campanian-Maastrichtian ~85–66 Ma | |
|---|---|
| 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 |
| 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) | |
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]
Fossil content
Dinosaurs
| Non-avian dinosaurs reported from Los Alamitos Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Material | Notes | Images | ||
| Aeolosaurus | A. rionegrinus |  | ||||
| Huallasaurus (="Kritosaurus" australis) | H. australis | "Partial skulls with associated postcrania, approximately [five] individuals." |  | |||
| Indeterminate theropod | ||||||
Birds
| Birds reported from the Los Alamitos Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Material | Notes | Images | ||
| Alamitornis | A. minutus | |||||
| cf. Hesperornithes | ||||||
| Indeterminate Ornithurine | ||||||
| Indeterminate Avian | ||||||
Rhynchocephalians
| Rhynchocephalians reported from the Los Alamitos Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Material | Notes | Images | ||
| Alamitosphenos | A. mineri | |||||
Mammaliaforms
| Mammaliaforms reported from the Los Alamitos Formation | ||||||
|---|---|---|---|---|---|---|
| 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
- List of dinosaur-bearing rock formations
References
- ↑ 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. https://www.tandfonline.com/doi/full/10.1080/14772019.2021.2020917.
- ↑ 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. doi:10.1080/02724631003763508.
- ↑ "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. doi:10.1016/j.pgeola.2023.09.007.
- ↑ Bonaparte, 1999
- ↑ Bonaparte & Soria, 1985
- ↑ Bonaparte, 1990
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
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