Basalt towers in New South Wales A basalt column is one solid piece of basalt rock, and basalt is just lava that has cooled and turned into stone.Millions of years ago, parts of New South Wales were shaped by volcanic activity. This happened mainly during the Cenozoic era (roughly 60–10 million years ago) when hot spots and movements in Earth’s crust allowed magma to rise and erupt at the surface.📹australiahiddengems