Fossilised circles in the sand on South Africa’s coast may be artwork by our early ancestors
If you have walked on a dune surface after windy conditions have settled, you may have been privileged to recognise one of Nature’s wonders: scratch circles. These are structures formed when the end of a tethered object is passively rotated into the surrounding sediment. In other words, a flimsy frond or blade of grass that […]
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