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Los Alamitos Formation

Coordinates: 42°06′S 66°18′W / 42.1°S 66.3°W / -42.1; -66.3
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Los Alamitos Formation
Stratigraphic range: Late Campanian-Maastrichtian
~85–66 Ma
TypeGeological formation
Sub-unitsColi Toro Member
Lithology
PrimarySiltstone
OtherSandstone
Location
Coordinates42°06′S 66°18′W / 42.1°S 66.3°W / -42.1; -66.3
Approximate paleocoordinates45°00′S 52°18′W / 45.0°S 52.3°W / -45.0; -52.3
RegionRío Negro Province
CountryArgentina
ExtentNorth Patagonian Massif
Los Alamitos Formation is located in Argentina
Los Alamitos Formation
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

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Paleogeography of the Late Cretaceous with Los Alamitos Formation indicated

Dinosaurs

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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

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Genus Species Material Notes Images
Alamitosphenos A. mineri
Kawasphenodon K. expectatus

Snakes

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Genus Species Material Notes Imaes
Alamitophis A. elongatus

Mammaliaforms

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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

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References

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  1. ^ Weishampel et al., 2004, "Dinosaur distribution (Late Cretaceous, South America).", pp.600-604
  2. ^ 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.
  3. ^ 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.
  4. ^ "Table 20.1," in Weishampel, et al.
  5. ^ 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.
  6. ^ 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.
  7. ^ Bonaparte, 1999
  8. ^ Bonaparte & Soria, 1985
  9. ^ Bonaparte, 1990

Bibliography

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