This paper takes into account all factors that affected the preservation of tombs and their inventories in the burial grounds of ancient Crustumerium, a Latin settlement 13 km north of Rome, inhabited between the 9th and 5th c. BC. Its aim is to highlight the combined effect of two main processes;a) the severe erosion of the topsoil and the underlying soft volcanic bedrock caused by centuries of ploughing that has profoundly affected the preservation of tomb architecture, i.e. landscape processes;b) post-depositional processes affecting organic materials (wood, textiles, human bone) and inorganic materials (pottery, metal) in the tombs as a result of flooding, collapse and the acidity of the soil, i.e. taphonomy