Between the 18th and 29th October 2010 the fourth excavation campaign took place in the locality of Monte Bono (municipality of Guardistallo). The excavation area was extended to the east and west.

The continuity with the US identified in the previous campaigns relating to the destruction of the ancient structures and to the alteration of the archaeological deposit, caused by agricultural activity, was checked.

For logistical reasons a test pit (1.50×1.50 m) was dug in the central sector of the trench in order to check the stratigraphy below a substantial mass of material, US 13, present at a depth of between 108 and 139 cm below ground level. At the latter level US 17 was exposed. This was a very compact layer with a yellowish-green sandy-clay matrix, containing a very few fragments of pottery (amphorae and coarse ware), whilst brick/tile seemed absent.

The data acquired during the 2010 campaign confirmed with greater precision the chronology of the site’s occupation which dates to between the late Republican period (latest evidence of black glaze ware, fragments of Dressel 1 amphorae) and the 1st century A.D. The absence to date of ARS and decorated late Italian sigillata would seen to indicate that the site was abandoned before the end of the 1st century A.D. The topographical organisation of the structures relating to the layers of accumulated material remains problematical. In fact, the latter are quite thick (30 cm) but, given the presence of at least eight dolia attested by rim fragments, their surface area appears too small to comprise a warehouse and residential structure (the presence of a residential structure was further confirmed by the find of numerous coarse ware and cooking ware fragments and a third loom weight).

A greater understanding of this problem, through a further increase in the excavation area, will be the main objective of future campaigns.