Surat Basin

The Surat Basin of northern New South Wales is part of the Great Artesian Basin, a large Jurassic–Cretaceous intra-cratonic basin that covers 1.7 million km2 of eastern Australia. In NSW, the Surat Basin covers an area of 270 000 km2 and has a maximum thickness of approximately 1.8 km in northern NSW.

The basin unconformably overlies the early to late Palaeozoic Lachlan Orogen in the western to central part of the basin, and in the east overlies the Permian to Triassic Sydney–Gunnedah–Bowen Basin system. Palaeozoic basement highs, the Nebine Ridge and Kumbarilla Ridge respectively, mark the basin's boundaries with the Eromanga Basin to the west and the Clarence–Moreton Basin to the east.