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From what has been said above it is tempting to see the complex of valley settlements on the gravel terraces and ﬂood plain as part of a single socio-economic system operating a subsistence strategy based on the exploitation of a number of discrete ecological zones. Such a system would have required co-operation which would have encouraged the growth of larger settlement agglomerations. The limestone hill sites, on the other hand, could well have been self-contained units exploiting the range of rich soils in their hinterlands. Thus two entirely different social systems may have emerged in the region by the Middle Iron Age (Hingley 1984b).