By Richard I. Gibson
Much of Western Australia is underlain by Archean or early Proterozoic rocks in two major cratons, the Yilgarn and Pilbara Blocks. It’s likely that these blocks extend in the subsurface into central Australia, but most of Eastern Australia is much younger in terms of the age of formation of the basement rocks there.
Original map by Rolinator, via Wikipedia under GNU free documentation license.
Here is the podcast: