Geologists have long known that 42 of Stonehenge's smaller stones, known as 'bluestones', came from the Preseli hills in Pembrokeshire, west Wales. Now a new study published in Antiquity pinpoints the exact locations of two of these quarries and reveals when and how the stones were quarried... Professor Mike Parker Pearson (UCL Archaeology) and leader of the team, said: "What's really exciting about these discoveries is that they take us a step closer to unlocking Stonehenge's greatest mystery - why its stones came from so far away. Every other Neolithic monument in Europe was built of megaliths brought from no...