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]

Not to be confused with Alamitos Formation.
Los Alamitos Formation
Stratigraphic range: Late Campanian-Maastrichtian
~
TypeGeological formation
Sub-unitsColi Toro Member
Lithology
PrimarySiltstone
OtherSandstone
Location
Coordinates42.1°S 66.3°W / -42.1; -66.3
Approximate paleocoordinates45.0°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)

Fossil content
Paleogeography of the Late Cretaceous with Los Alamitos Formation indicated

Dinosaurs
Non-avian dinosaurs reported from Los Alamitos Formation
GenusSpeciesMaterialNotesImages
Aeolosaurus A. rionegrinus
Huallasaurus (="Kritosaurus" australis) H. australis "Partial skulls with associated postcrania, approximately [five] individuals."
[2][3][4]
Indeterminate theropod

Birds
Birds reported from the Los Alamitos Formation
GenusSpeciesMaterialNotesImages
Alamitornis A. minutus
cf. Hesperornithes
Indeterminate Ornithurine
Indeterminate Avian

Rhynchocephalians
Rhynchocephalians reported from the Los Alamitos Formation
GenusSpeciesMaterialNotesImages
Alamitosphenos A. mineri
[5]

Mammaliaforms
Mammaliaforms reported from the Los Alamitos Formation
GenusSpeciesMaterialNotesImages
Alamitherium A. bishopi
[6]
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
[7]
Paraungulatum P. rectangularis
Reigitherium R. bunodontum
[8]
Rougiertherium R. tricuspes

See also

References
  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. 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. doi:10.1016/j.pgeola.2023.09.007.
  6. Bonaparte, 1999
  7. Bonaparte & Soria, 1985
  8. 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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