While there have been discoveries of archaeological evidence of human occupation of the Rome area from approximately 14,000 years ago, the dense layer of much younger debris obscures Palaeolithic and Neolithic sites. Evidence of stone tools, pottery, and stone weapons attest to about 10,000 years of human presence. Several excavations support the view that Rome grew from pastoral settlements on the Palatine Hill built above the area of the future Roman Forum. Between the end of the Bronze Age and the beginning of the Iron Age, each hill between the sea and the Capitol was topped by a village (on the Capitol Hill, a village is attested since the end of the 14th century BC). However, none of them yet had an urban quality. Nowadays, there is a wide consensus that the city developed gradually through the aggregation ("synoecism") of several villages around the largest one, placed above the Palatine. This aggregation was facilitated by the increase of agricultural productivity above the subsistence level, which also allowed the establishment of secondary and tertiary activities. These, in turn, boosted the development of trade with the Greek colonies of southern Italy (mainly Ischia and Cumae). These developments, which according to archaeological evidence took place during the mid-eighth century BC, can be considered as the "birth" of the city. Despite recent excavations at the Palatine hill, the view that Rome was founded deliberately in the middle of the eighth century BC, as the legend of Romulus suggests, remains a fringe hypothesis.