Wake In Fright (1971)
Mad Max turns out not to be the most apocalyptic vision of gritty ’70s Australian cinema. For that, I nominate the once thought lost film Wake in Fright.
It isn’t a post-apocalyptic film per se, but I can’t even tell you much apocalyptica this barfs forth. You’ll just have to see it for yourself, but the image should give you some idea…
http://www.imdb.com/title/tt0067541/
http://www.imdb.com/title/tt0067541/mediaviewer/rm2685251072