The Pilbara is, geologically, one of the oldest regions in Australia, containing rocks that are more than 3600 million years old, forming when the Earth was still very young. With such ancient rocks, the Pilbara is now internationally known as the best 'field laboratory' for studying the early history of Earth. Geology and Landforms of the Pilbara has a wealth of information crammed into this pocket-sized guide. Pocket sized publication.