"Dot and the Kangaroo" and "Blinky Bill" I do know (I have the former on DVD - and Ccook, it is indeed a 70s production), but I'm afraid that "Skippy's Adventures in Bushtown" appears to have completely passed me by. I did a google search to see if I could find anything to jog my memory, but...there doesn't appear to be very much available right now. Not so much as a single 30-second youtube video.
The Australian cartoon of which I have the most distinctive memories from my childhood would be the
Silver Brumby series of the mid-90s, which was adapted (quite loosely, I hear) from books by Elyne Mitchell.