Various hypotheses regarding the function of these fortifications are discussed. At present, the most probable is that they were erected to deter raids by indigenous Mesolithic hunter-gatherers, but other plausible hypotheses cannot be entirely excluded. It is also argued that the defense of these sites involved cooperation among several villages. Comparisons between the lithic inventories at these sites and some others nearby indicate that there was village specialization in flint blade and grondstone adze production.
Some evidence also suggests village specialization in ceramic production.
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