To our right is part of the 5 km thick Sydney Sandstone basin that runs from Newcastle to Bateman's Bay and west to the Blue Mountains. At the bottom of these cliffs is/was a large amount of coal. "Permian: 299–252 million years ago; The settling and evolution of swamp forest, which would shape tremendous coal measures. Note, Australia's coal is younger than the Carboniferous coal of the Northern Hemisphere."