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Basic geological regions of Australia, by age.
Australian Shield, also called the Western Australian Shield or Western Plateau, occupies more than half of the continent of Australia. It occupies the portion of Australia west of a line running north-south roughly from the eastern shore of Arnhem Landmarker on the Bay or Gulf of Carpentariamarker to the Eyre Peninsula in the state of South Australiamarker, and skirting to the west of the Simpson Desertmarker in the interior. The plateau has an average elevation of between 305 and 460 m (1,000 and 1,500 ft). The shield is fractured into a number of distinct blocks, including the Pilbara craton in the North and the Yilgarn craton in the Southwest. Some of these blocks have been raised to form uplands; others have been depressed, forming lowlands and basins. The lowlands include the Great Sandy Desert, the Gibson Desertmarker, the Great Victoria Desertmarker, and the Nullarbor Plain, which are located in the north-western, central, southern, and south-eastern shield areas respectively. The Nullarbor (from Latin, “no trees”) is an arid, virtually uninhabited limestone plateau. Between the Western Australian Shield and the Great Dividing Rangemarker is the Great Artesian Basin region

The uplands include, in Western Australiamarker, the Hamersley and King Leopold ranges in the western and north-western coastal areas, and the Darling Range inland from Perthmarker in the far south-west. The MacDonnell Ranges lie in the southern part of the Northern Territorymarker, and the Stuartmarker and Musgrave Rangesmarker are located in the north of the state of South Australia. Erosion and weathering have created striking, isolated rock formations, called mesas or buttes, in many parts of the shield, including the Kimberleymarker and Pilbaramarker districts of Western Australia and Arnhem Landmarker in the Northern Territorymarker.

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