Los Alamitos Formation

Coordinates: 42°06′S 66°18′W / 42.1°S 66.3°W / -42.1; -66.3
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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°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
Country Argentina
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

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."
[2][3]
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
[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

See also

References

  1. ^ Weishampel et al., 2004, "Dinosaur distribution (Late Cretaceous, South America).", pp.600-604
  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

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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