The Ligurian settlement touched all three of the hills into which the relief of Pietra Pertusa is divided, probably with small scattered groups of dwellings similar to those found at Monte Pisone. The position of the site puts Pietra Pertusa among a series of small Ligurian settlements, situated along routes following the mountain ridges, according to a settlement pattern characteristic of the Valdinievole area. The black glazed pottery, produced in Lazio and Campania, and the large number of wine anforae of south Italian origin that have been found, prove the vitality of trade with the Etruscans in the decades around the middle of the IIIrd century b.C.. In exchange for the goods arriving by sea at Pisa and at other landing points along the coast, the Ligurians offered the products of their sheep-breeding and woodland economy. The end of the settlement, in the second half of the IIIrd century b.C., together with the desertion of Bora dei Frati in Versilia, the bloody end of the Etruscan village of Ponte Gini di Orentano on the edges of the Auser plain and the general change of Ligurian settlement patterns, show a breakdown in the delicate cohabitation balance between Etruscans and Ligurians as a consequence of Roman expansionism.