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Angostura Formation may refer to:

Angostura Colorada Formation, Late Cretaceous geologic formation of Argentina
Angostura Formation, Chile, Early to Middle Miocene geologic formation of Chile
Angostura Formation, Colombia, Eocene geologic formation of Colombia
Angostura Formation, Ecuador, Late Miocene geologic formation of Ecuador
Angostura Formation, Mexico, Late Miocene geologic formation of Mexico

source: https://en.wikipedia.org/wiki/Angostura_Formation