UWS may offer Geology (and if not then they would offer geography, and most geography departments seem to offer physical, environmental and human streams, so you could always try that path).
Edit: UWS doesn't seem to offer Geography or Geology as a unit of study... I know that Geography related units are taught at UWS, but looking at the university's course listing... Wollongong, as White Rabbit posted, is always an option.