STONEHENGE bluestone blocks did arrive over land, archaeologists have concluded – debunking a controversial claims the giant slabs were floated on rafts from Wales to the Salisbury Plain. Experts have long been suspected the famous Neolithic monument is constructed of both local stones and some sourced from much further away, in Wales’ Preseli Hills. The debate over which path these rocks took to Stonehenge has long been anchored by a unique block called the Altar Stone, thought collected en-route. [contfnewc] A popular theory had suggested the Altar Stone arrived from the Pembrokeshire coast, with the blocks then sent up the Bristol Channel. [contfnewc] However, a new analysis of the age and mineral composition of both the Altar Stone and its supposed source revealed the two actually do not match. The Altar Stone is instead likely to have arrived from further east — near the modern-day town of Abergavenny — suggesting the bluestones were transported by land. In fact, the stones..