Angostura Colorada Formation
Stratigraphic range: Campanian-Maastrichtian
Type	Geological formation
Underlies	Coli Toro Member, Huitrera & Collón Cura Formations
Overlies	Sañicó Formation
Lithology
Primary	Sandstone, claystone, conglomerate
Location
Coordinates	41°18′S 68°42′W / 41.3°S 68.7°W / -41.3; -68.7
Approximate paleocoordinates	43°54′S 54°42′W / 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.^[1]

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,^[2] and in other parts by the Coli Toro Member of the Los Alamitos Formation.^[3] The formation, outcropping south of Comallo, comprises sandstones, claystones and conglomerates deposited in a fluvial environment.^[4]

• Aeolosaurus rionegrinus^[1]
• Hadrosauridae indet.
• Saltasaurinae indet.^[5]
• Lithostrotia indet.^[1]

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

• 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
• 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.

• 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