Angostura Colorada Formation
Introduction 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 Member of the Los Alamitos Formation. The formation, outcropping south of Comallo, comprises sandstones, claystones and conglomerates deposited in a fluvial environment.
Paleofauna * ''Aeolosaurus rionegrinus''* Hadrosauridae indet. * ''Saltasaurinae indet. ''* Lithostrotia indet.
See also * List of dinosaur-bearing rock formations** List of stratigraphic units with few dinosaur genera
References === Bibliography ===* * *  * *
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