Los Alamitos Formation
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 ~85–66 Ma | |
|---|---|
| Type | Geological formation |
| Sub-units | Coli Toro Member |
| Lithology | |
| Primary | Siltstone |
| Other | Sandstone |
| Location | |
| Coordinates | 42.1°S 66.3°W |
| Approximate paleocoordinates | 45.0°S 52.3°W |
| Region | Río Negro Province |
| Country |  Argentina |
| Extent | North Patagonian Massif |
  Los Alamitos Formation (Argentina) | |
Fossil content
Paleogeography of the Late Cretaceous with Los Alamitos Formation indicated
Dinosaurs
| Non-avian dinosaurs reported from Los Alamitos Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Material | Notes | Images | ||
| Aeolosaurus | A. rionegrinus |  | ||||
| Secernosaurus (="Kritosaurus" australis) | S. koerneri | "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 | ||||||
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
- 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.
- 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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