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
~85–66 Ma
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
Country Argentina
ExtentNorth 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
GenusSpeciesMaterialNotesImages
Aeolosaurus A. rionegrinus
Secernosaurus (="Kritosaurus" australis) S. koerneri "Partial skulls with associated postcrania, approximately [five] individuals."
[2][3]
Indeterminate theropod

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

Mammaliaforms
Mammaliaforms reported from the Los Alamitos Formation
GenusSpeciesMaterialNotesImages
Alamitherium A. bishopi
[4]
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
[5]
Paraungulatum P. rectangularis
Reigitherium R. bunodontum
[6]
Rougiertherium R. tricuspes
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See also
  • List of dinosaur-bearing rock formations

References
  1. Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Cretaceous, South America)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 600-604. ISBN 0-520-24209-2.
  2. 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.
  3. "Table 20.1," in Weishampel, et al.
  4. Bonaparte, 1999
  5. Bonaparte & Soria, 1985
  6. Bonaparte, 1990
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