Sand dunes are not an obvious place to find high-quality fire records. For a start, anyone who walks on the forested sand dunes of South-East Queensland will be impressed by the intensity of ant activity at their feet. The ant nests extend at least 2 meters below the surface. As the ants move materials around their nests, any charcoal from past fires that’s preserved in the sand would be severely disturbed.
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Source: Phys.org