came about through contact with continental European societies, although it is unclear to what extent this can be attributed to an influx of migrants or to indigenous Mesolithic Britons adopting agricultural technologies from the continent. The region of modern Kent would have been key for the arrival of continental European settlers and visitors, because of its position on the estuary of the River Thames and its proximity to the continent. Britain was then largely forested; widespread forest clearance did not occur in Kent until the Late Bronze Age (c.1000 to 700 BCE). Environmental data from the vicinity of the White Horse Stone, a putatively prehistoric monolith near the River Medway, supports the idea that the area was still largely forested in the Early Neolithic, covered by a woodland of oak, ash, hazel/alder and amygdaloideae. Throughout most of Britain, there is little evidence of cereal or permanent dwellings from this period, leading archaeologists to believe that the island's Early Neolithic economy was largely pastoral, relying on herding cattle, with people living a nomadic or semi-nomadic life. Medway Megaliths Across Western Europe, the Early Neolithic marked the first period in which humans built monumental structures in the landscape. These structures included chambered long barrows, rectangular or oval earthen tumuli which had a chamber built into one end. Some of these chambers were constructed out of timber, although others were built using large stones, now known as "megaliths". These long barrows often served as tombs, housing the physical remains of the dead within their chamber. Individuals were rarely buried alone in the Early Neolithic, instead being interred in collective burials with other members of their community. These chambered tombs were built all along the Western European seaboard during the Early Neolithic, from southeastern Spain up to southern Sweden, taking in most of the British Isles; the architectural tradition was introduced to Britain from continental Europe in the first half of the fourth millennium BCE. Although there are stone buildings—like Göbekli Tepe in modern Turkey—which predate them, the chambered long barrows constitute humanity's first widespread tradition of construction using stone. Although now all in a ruinous state and not retaining their original appearance, at the time of construction the Medway Megaliths would have been some of the largest and most visually imposing Early Neolithic funerary monuments in Britain. Grouped along the River Medway as it cuts through the North Downs, they constitute the most