Mungo Man and Mungo Lady
By the way, I am not sure how many poeple know the background of Lake Mungo and I think it adds something to the film, especially the choice of that area for the climactic element of the story.
"Lake Mungo is a dry lake in south-western New South Wales, Australia. [..] Many important archaeological findings have been made at the lake, most significantly the discovery of the remains of Mungo Man, the oldest human remains found in Australia[2], and Mungo Lady, the oldest human remains in the world to be ritually cremated."
http://en.wikipedia.org/wiki/Lake_Mungo