Eucla Basin

Eucla Basin, artesian depression in Western Australia and South Australia, Australia. Sloping southward to the Great Australian Bight and underlying the enormous limestone waste of the Nullarbor Plain, its area is about 69,500 square miles (180,000 square km). Composed of two main aquifers, the upper layer of the basin is a sequence of Neogene and Paleogene limestones (those about 2.6 to 65 million years old) and the deeper layer is composed of sandstone of Cretaceous...