Protohistoric pastoral landscape in northern Istria revealed by airborne LiDAR: hill forts, enclosures and long linear walls in the Mali Kras plateau (southwestern Slovenia)

This paper presents the results of an international research aimed at investigating the ancient landscape of the Mali Kras plateau, a sector of northern Istria (southwestern Slovenia). The remains of two main protohistoric hill forts, Mali Kras and Socerb, and a few minor sites were already reported from this area. A cemetery, associated with Socerb hill fort, was in use between the sixth century BC and the first century AD. Airborne LiDAR remote sensing of Mali Kras plateau has allowed to identify several unknown archaeological features, ranging from approximately square features (30 × 30 m) to larger enclosures with different shapes, very long linear features and stone mounds. The elaboration and digitization of high-definition remote sensing data compared with historical cartography, field surveys, targeted small-scale excavations and thermoluminescence dating have been performed in order to decode the complex archaeological palimpsest. The square structures can be attributed to Middle-Recent Bronze Age on the basis of pottery finds. These structures are located close to natural passages from the plateau to the gulf of Trieste, in areas with low visibility and scarcity of soil, which were traditionally used for grazing activities. The other identified enclosures, some of them sharing a similar chronology, were also probably used for pastoral activities but for other purposes since their shape and size are different. Two main long drystone walls define the southeastern sector of Mali Kras plateau in correspondence of the most accessible entrance to the area. The preliminary data and comparisons with similar structures suggest these walls could correspond to protohistoric linear boundaries built to delimit grazing or agricultural areas under direct control of the nearby settlements. The enclosures identified at Mali Kras plateau, most probably connected to herding activities, and perhaps the long linear walls too, could reflect the development of new husbandry practices in the Middle-Recent Bronze Age in the karst areas of the north Adriatic hinterland, such as observed in the alpine territory.