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The Otway-Gippsland Basin, bound to the north by the Victoria Divide, accumulated sediment from the early Cretaceous. At about 80 Ma, tectonic rifting along the line of the present continental shelf cut off the headwaters of Australian rivers then rising in Pacifica, beheading many rivers and reducing the sediment supply to the sedimentary basins. The input of coarse fluvial sediment to the Eromanga-Surat Basin ceased, but was maintained to the Otway-Gippsland Basin. In the Palaeocene, the Murray Basin started to sink, creating a divide between the Murray and Eromanga-Surat Basins and cutting off the southern sediment supply to the latter. Down-warping along the Tasman Sea margin formed the Great Divide between Tasman Sea drainage and the inland sedimentary basins. Rivers east of this divide were reversed, and a Great Escarpment was formed which retreated inland. Cainozoic volcanicity and Miocene faults with throws of hundreds of metres have further complicated the topography. 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