Puelche

(map)

A flood covered all the earth except the Sierra de la Ventana. After the flood, the people came from the caves in the mountain and populated the world again.

John M. Cooper, "The Patagonian and Pampean Hunters", in Handbook of South American Indians, ed. Julian H. Steward (New York: Cooper Square, 1963), 1: 168.

Two sisters had dead children and did not want to bury them. Therefore their younger brother insulted them and gave them the worst meat. The younger sister dived into the sea to die, carrying her dead son. Then the older sister did likewise. The brother on land called out; the elder sister looked back. The sea grew angry and carried off the brother too. The elder sister was transformed into a siren; the younger into another sea animal.

Lehmann-Nitsche, Robert. 1919 "Mitología sudamericana. III: La marea alta según los Puelche de la Patagonia". Revista del Museo de La Plata 24(part 2, series 2): 206-209.