Picnic at Hanging Rock is a 1975 Peter Weir film based on the novel by Joan Lindsay. It's a beautiful film. Criterion has released this one.
Online via GoogleVideo:
Moria gives it a top 5-star rating and says it's "an incredible and haunting film". Roger Ebert includes it on his list of "great movies" and calls it "a film of haunting mystery and buried sexual hysteria". FilmReference.com buys the myth that the story is based on fact. Images Journal reviews a video release. The New York Times describes it as "a kind of Australian horror-romance that recalls Nathaniel Hawthorne's preoccupation with the spiritual and moral heritage of his own New England landscape."
12/5/2009: Parallax View has an article.
1/10/2010: Ferdy on Films has a lengthy treatment.