answers: Preseli Hills
context: geologists from University of Leicester and the National Museum of Wales announced the discovery of the exact source of some of the rhyolite fragments found in the Stonehenge debitage. These fragments do not seem to match any of the standing stones or bluestone stumps. The researchers have identified the source as a long rock outcrop called Craig Rhos-y-Felin (), near Pont Saeson in north Pembrokeshire, located from Stonehenge. On 10 September 2014 the University of Birmingham announced findings including evidence of adjacent stone and wooden structures and burial mounds, overlooked previously, that may date as far back as 4000 BC. </s> of which are made of dolerite, an igneous rock), were transported by the builders from the Preseli Hills, away in modern-day Pembrokeshire in Wales. Another theory is that they were brought much nearer to the site as glacial erratics by the Irish Sea Glacier although there is no evidence of glacial deposition within southern central England. The long distance human transport theory was bolstered in 2011 by the discovery of a megalithic bluestone quarry at Craig Rhos-y-felin, near Crymych in Pembrokeshire, which is the most likely place for some of the stones to have been obtained. Other standing stones may </s> Mount Killaraus Mount Killaraus is a legendary mountain in Ireland, most famous for being the source of the stones of Stonehenge in Arthurian legend. Geoffrey of Monmouth records the story in his "Historia Regum Britanniae". He describes how Aurelius Ambrosius returned from his exile in Brittany and burnt Vortigern in his tower. Rallying the Britons, he triumphed over the Saxon invaders and executed their leader, Hengist. Following the victory he decided to set up a great memorial to his triumph at a place called Mount Ambrius. When his carpenters and masons were unable to come up with a suitable awe-inspiring
question: where did the stones from stone henge come from