The Lago Colhué HuapàFormation is a Late Cretaceous geologic formation of the Chubut Group in the Golfo San Jorge Basin in Patagonia, Argentina. The formation, named after Lake Colhué HuapÃÂ, is overlain by the Salamanca Formation of the RÃÂo Chico Group and in some areas by the Laguna Palacios Formation.
The strata of the Lago Colhué Huapé Formation were thought to pertain to the Bajo Barreal Formation, but are now recognized as a distinct stratigraphic unit in their own right. The upper part of the Lago Colhué HuapàFormation has been dated to the upper Maastrichtian age of the late Cretaceous period. A basalt flow in the formation has been dated to , reinforcing the Late Maastrichtian age.
Taxa recovered from the Lago Colhué HuapàFormation include the sauropods Aeolosaurus, and Argyrosaurus, as well as the hadrosaurid Secernosaurus and the probable elasmarian ornithopod Sektensaurus. The dubious ornithischian Notoceratops was also present.