Angostura Colorada Formation

Angostura Colorada Formation
Stratigraphic range: Campanian-Maastrichtian
Type	Geological formation
Underlies	Coli Toro Formation, Huitrera & Collón Cura Formations
Overlies	Sañicó Formation
Lithology
Primary	Sandstone, claystone, conglomerate
Location
Coordinates	41.3°S 68.7°W / -41.3; -68.7
Approximate paleocoordinates	43.9°S 54.7°W / -43.9; -54.7
Region	Río Negro Province
Country	Argentina
Extent	Neuquén Basin, North Patagonian Massif
Type section
Named by	Volkhaimer
Year defined	1973
Angostura Colorada Formation (Argentina)

The Angostura Colorada Formation is a Campanian to Maastrichtian geologic formation of the Neuquén Basin and North Patagonian Massif in the Río Negro Province of Argentina. Dinosaur remains diagnostic to the genus level are among the fossils that have been recovered from the formation.

Description

The Angostura Colorada Formation was defined by Volkhaimer in 1973 and unconformably overlies the Late Triassic volcanics of the Sañicó Formation. The formation is partly overlain by the Huitrera and Collón Cura Formations, and in other parts by the Coli Toro Formation. The formation, outcropping south of Comallo, comprises sandstones, claystones and conglomerates deposited in a fluvial environment.

Fossil content

Color key Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon		Notes Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Dinosaurs

Ornithischians

Ornithischians of the Angostura Colorada Formation
Genus	Species	Location	Stratigraphic position	Material	Notes	Image
Hadrosauridae Indet.	Indeterminate
Parankylosauria Indet.	Indeterminate

Sauropods

Sauropods of the Angostura Colorada Formation
Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Aeolosaurus	A. rionegrinus				A aeolosaurin lithostrotian
Lithostrotia Indet.	Indeterminate
Saltasaurinae Indet.	Indeterminate

Theropods

Theropods of the Angostura Colorada Formation
Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Abelisauridae Indet.	Indeterminate

See also

• List of dinosaur-bearing rock formations
  • List of stratigraphic units with few dinosaur genera

References

Bibliography

• Ottone, Eduardo G (2009), "La flora cretácica de Cuenca Neuquina, su significado paleoambiental y paleoclimático" (PDF), Revista de la Asociación Geológica Argentina, 65: 373–386, retrieved 2018-09-08
• Prez, Horacio; Massaferro, Gabriela (2013), "Geología y geomorfología del tramo superior del Arroyo Comallo, Río Negro" (PDF), Contribuciones Científicas GÆA, 26: 221–234, retrieved 2018-09-08
• Weishampel, David B.; Dodson, Peter; Osmólska, Halszka (2004), The Dinosauria, 2nd edition, Berkeley: University of California Press, pp. 1–880, ISBN 0-520-24209-2, retrieved 2019-02-21{{citation}}: CS1 maint: publisher location (link)
• Cruzado-Caballero, P. (2017). "New hadrosaurid remains from the Late Cretaceous of Río Negro Province (Argentina, Late Cretaceous)". Journal of Iberian Geology. 43 (2): 307–318. Bibcode:2017JIbG...43..307C. doi:10.1007/s41513-017-0023-5. hdl:11336/73174. Retrieved 2021-04-07.
• Zurriaguz, Virginia; Martinelli, Agustín; Rougier, Guillermo W.; Ezcurra, Martín D.; Manabe, Makoto; Tsuihiji, Takanobu; Novas, Fernando E. (2017). "A saltasaurine titanosaur (Sauropoda: Titanosauriformes) from the Angostura Colorada Formation (upper Campanian, Cretaceous) of northwestern Patagonia, Argentina". Cretaceous Research. 75: 101–114. Bibcode:2017CrRes..75..101Z. doi:10.1016/j.cretres.2017.03.016. hdl:11336/65494. Retrieved 2023-01-29.

Further reading

• J. E. Powell. 1987. The Late Cretaceous fauna of Los Alamitos, Patagonia, Argentina part VI—the titanosaurids. Revista del Museo Argentina de Ciencias Naturales "Bernardino Rivadavia" e Instituto Nacional de Investigacion de las Ciencias Naturales: Paleontología 3(3):147-153