On a recent trip to Western Australia my wife and I visited Jewel Cave just outside of Augusta. The cave was discovered in 1951. In the bottom of the cave they found the skeletal remains of a Tasmanian Tiger which has be dated at 25,000 BP. I was intrigued!
It shows that I haven't read enough about WA, but it was the first time I had heard of the Thylacine in the west. Apparently there have been
quite a few discoveries. Two skeletons in the North, and many more in caves in the south east. Even more fascinating, I discovered that there are rock painting in Kimberly and other regions that show that aborigines probably domesticated Thylacines some years before the introduction of dingoes (
reference).
Indeed, fossil remains have been found right across Australia and in New Guinea (
reference).