Great Australian Bight
The Great Australian Bight, the largest indentation on the Australian coast, is said to be the longest line of seacliffs in the world. The white coloured rock near the base of the cliffs is known to geologists as Wilson Bluff Limestone and it was formed on the seabed between 38 and 42 million years ago.
Edmund Alfred Delisser, the surveyor who named the Bluff, reported that "the body of an immense whale was embedded at the base of the cliff". The greyish coloured rock above the white limestone is called Miocene Nullarbor limestone because it was laid down during the Miocene epoch.
Most Australians consider the Great Australian Bight to be the curve extending from Cape Pasley, in the west, to Cape Carnot, near Port Lincoln, a distance of 1160 kilometres, however, according to the definition laid down by the International Hydrographic Bureau in 1953, the Bight commences in the west at West Cape Howe and stretches to South West Cape in Tasmania. It also stated that the boundary between the Bight and Bass Strait was a line from Cape Otway, in Victoria, through King Island to Cape Grim, Tasmania. Another interesting point is that Australia appears to be the only nation which recognises the Southern Ocean, to most of the world it is still the Indian Ocean.
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