Investigation of the manmade prehistoric tumulus situated near S. Osvaldo in the locality of Pras de Tombe concentrated on the eastern half of the north-east quadrant. The depth of the structure (30-40 cm) must originally have been greater, as shown by the presence of traces of colluvium/slippage on the upper part. In all probability the accumulation of gravel strata must have still be well preserved in the late Roman period, when a lime kiln was built abutting the east side of the tumulus. In fact, this structure was completely filled with gravel that had slipped down inside it after it went out of use.

That the stratigraphy must have been much deeper is also suggested by the surface find, near the summit, of the fragments of an almost complete glass bottle and a blue glass paste bead, dating to the period of the kiln and perhaps originally buried in a ditch.

Once the deposit of ferretto and gravel below the surface was removed a deposit containing only occasional fragments of Bronze age pottery was revealed. The latter’s removal uncovered a wide rim of cobbles belonging to the facing of a quadrangular tomb structure, on a north-west/south-east alignment. The tomb contained the skeleton of a male individual aged between 25-35 years. The C14 dating of a bone fragment (2040-1760 B.C. CA 2ơ) confirmed the Bronze Age dating of the tumulus. (MiBAC)