One thousand eight hundred years ago three proto-continents joined to form a major part of what would later be Australia. They can be identified as analogous to present day South Australia. the Northern Territory and Western Australia. ⧗ blog on geological composed ⧗
As recently as 1,400 million years back an inland sea separated SA and WA. It made volcanic mountains by subduction. Erosion later created the continental land mass we know today. It is not just a slumbering giant. Much activity has gone into its formation.