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′S66°18′W / 42.1°S 66.3°W / -42.1; -66.3
Approximate paleocoordinates 45°00′S52°18′W / 45.0°S 52.3°W / -45.0; -52.3
Region Río Negro Province
CountryArgentina
Extent North Patagonian Massif
Relief Map of Argentina.jpg
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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]

Contents

Fossil content

Paleogeography of the Late Cretaceous with Los Alamitos Formation indicated Paleogeography Gondwana - Late Cretaceous-Early Paleogene - around 85-63 Ma.jpg
Paleogeography of the Late Cretaceous with Los Alamitos Formation indicated

Dinosaurs

GenusSpeciesMaterialNotesImages
Aeolosaurus A. rionegrinusA titanosaur.
Aeolosaurus-rionegrinus-JD-2020-1.png
Alamitornis A. minutusAn ornithuromorph.
Huallasaurus H. australis"Partial skulls with associated postcrania, approximately [five] individuals."A hadrosaur formally named "Kritosaurus" australis .
Hadrosaur museum.jpg
cf. Hesperornithes
Indeterminate theropod
Indeterminate ornithurine
Indeterminate avian

Rhynchocephalians

GenusSpeciesMaterialNotesImages
Alamitosphenos A. mineri
[5]
Kawasphenodon K. expectatus
[6]

Snakes

GenusSpeciesMaterialNotesImaes
Alamitophis A. argentinus

Mammaliaforms

GenusSpeciesMaterialNotesImages
Alamitherium A. bishopi
[7]
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
[8]
Paraungulatum P. rectangularis
Reigitherium R. bunodontum
[9]
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. 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