Sierra de las Quijadas, National Park. San Luis.

The Sierra de las Quijadas National Park covers an area of 150,000 ha. In the past it was a region inhabited by the Huarpes Indians. It has been verified the existence of pterosaurs or flying reptiles of 100 million years ago, having footprints of dinosaur footprints 120 million years ago. It was created in 1991 to conserve representative environments of the Chaco Arid and Mount, and to preserve its archaeological and paleontological sites. One of the reasons that influenced the choice of area was the existence of a unique geological formation in the north center of the Sierras, called Potrero de la Aguada. It consists of a huge natural amphitheater surrounded by abrupt sandstone walls and reddish colored agglomerates, in which erosion has carved the most capricious forms.