It's 850 kilometres north of Perth, 490 kilometres east of Carnarvon, and is some 1.6 billion years old - what is it? It's Mount Augustus, the world's biggest rock (a 'monocline'). While it's ...

As the world's largest monocline Mt Augustus has a central ridge which is almost 8 kilometres long and it is estimated that the rock of the mountain is some 1000 million years old.