Black Mountain (Kalkajaka) National Park | natural history

Natural history

The national park's distinctive hard granite boulders and range originally formed out of magma that first slowly solidified under the Earth's crust about 250 million years ago.[5]

The softer land surfaces above the solidified magma eroded away over time, leaving the magma's fractured top to be exposed as a mountain of grey granite boulders blackened by a film of microscopic blue-green algae growing on the exposed surfaces. Colder rains falling on the dark, heated granite boulders causes the boulders to progressively fracture, break, and slowly disintegrate, sometimes explosively.[5]

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