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around the Devils Marbles campsite 2008 How were The Devils Marbles formed? The formation of The Devils Marbles are a result of the erosion of the sandstone on top of granite (which was formed millions of years ago due to the hardening of magma within the earth’s crust)- which the Marbles are made up of. The folding of the earth’s crust lead to the lifting of the granite and the erosion of the sandstone, after the granite came to the surface, pressure was lost and the granite expanded causing cracks to form and fall apart in large, square blocks. Over time, as the square blocks were exposed to water, their surface began to decay. A layer of the rock was flushed away by water and blown away by wind. The rounded shape of these blocks resulted from both mechanical and chemical weathering, the surface of the rocks often expand or shrink as a result of chemical processes. Because the chemical processes affect the areas with edges more, a rounded shape is formed. The boulders are also suffering from solarisation and temperature differences between day and night- causing the boulder to crack and sometimes split in half. Reference.. thedevilsmarbles1.weebly.com/formation.html