Most ancient farmers in southern Africa built with mud walls. Attacked by the elements, mud walls melt and in due time revert to soil. Ancient farmers' buildings vanish without a trace. Or do they? Archaeological studies by McIntosh in West Africa indicated that careful analysis of soil particle sizes could reveal where mud walls once stood. This paper shows that the same method works in Botswana too, so former mud walls can perhaps be detected with careful excavation and analyses.
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