Photography by Martin Chalk
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NPAACT Home > Gallery > Rocks in and around Namadgi > 010 Basalt columns

010 Basalt columns

010 Basalt columns - Photography by Kevin McCue

Along the Murumbidgee River Corridor you may see these long polygonal columns which crystallised when molten fluid basalt that was extruded during a period of volcanism some 420 million years ago cooled. The long axis of the crystal (column) is parallel to the cooling surface.

Photography by Kevin McCue

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