Angostura Colorada Formation, Geological formation in Río Negro Province, Argentina
Angostura Colorada Formation is a geological sequence in Rio Negro composed of sandstones, claystones, and conglomerates layered over time. These rocks form part of the larger Neuquén Basin and contribute to understanding the North Patagonian Massif's structure.
The formation developed during the Late Cretaceous period, from the Campanian through Maastrichtian ages roughly 72 million years ago. It was first scientifically documented in 1973 and has since become a key reference for understanding South American geology.
Scientists from multiple institutions conduct regular research expeditions to study the fossilized remains of dinosaurs preserved within the formation's sedimentary layers.
The rock layers are found in a remote area and are best reached during summer months when road conditions are more favorable. Visitors should come prepared with sturdy footwear and protective gear, as the terrain is rugged with exposed edges.
The rock formation preserves remains of Aeolosaurus rionegrinus, a long-necked sauropod that lived in this region. Such finds demonstrate that different dinosaur groups coexisted across South America during this time.
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