1. Igneous Rocks:
* Basalt: Found extensively in eastern Australia (Great Dividing Range, Tasmania), volcanic plateaus, and the Tasman Sea.
* Rhyolite: Common in the Lachlan Fold Belt (NSW) and the Gawler Craton (SA).
* Granite: A major component of the Australian Shield, especially in Western Australia and Northern Territory.
* Dolerite: Found in dykes and sills, often associated with volcanic activity, particularly in Victoria and Tasmania.
2. Sedimentary Rocks:
* Sandstone: Widespread across Australia, notably in the Sydney Basin (NSW), the Great Artesian Basin (Queensland), and the Carnarvon Basin (WA).
* Limestone: Found in the Nullarbor Plain (SA), the Great Barrier Reef, and various caves throughout the country.
* Shale: Common in the Sydney Basin, the Canning Basin (WA), and the Cooper Basin (SA).
* Coal: Major deposits occur in the Bowen Basin (Queensland), the Hunter Valley (NSW), and the Latrobe Valley (Victoria).
3. Metamorphic Rocks:
* Schist: Formed from the transformation of sedimentary and igneous rocks under intense heat and pressure, found in the Lachlan Fold Belt, the Tasman Fold Belt (Tasmania), and the Yilgarn Craton (WA).
* Gneiss: Another metamorphic rock, often found alongside schist, with a more banded appearance.
* Marble: Formed from the metamorphism of limestone, found in various locations, including the Flinders Ranges (SA).
4. Other Notable Rock Types:
* Bauxite: An aluminum ore, found in large deposits in Western Australia and Queensland.
* Iron Ore: Extensive deposits exist in Western Australia's Pilbara region.
* Opal: Australia is renowned for its opal production, especially in Lightning Ridge (NSW) and Coober Pedy (SA).
Key Geological Features:
* Australian Shield: An ancient, stable core of the continent, composed mostly of granite and metamorphic rocks.
* Sedimentary Basins: Large areas where layers of sedimentary rocks have accumulated over millions of years.
* Volcanic Provinces: Areas where volcanic activity has occurred, leaving behind basalt flows, rhyolite domes, and other igneous formations.
Note: This is just a brief overview of rock types found in Australia. The diversity and specific occurrences vary significantly across the vast continent.
