Received wisdom has it that the smaller blue stones to be found at Stonehenge came from the Presili hills in Pembrokeshire, South Wales. This is of course some 240 miles from the site in Wiltshire. I have always wondered about this. How did they know they were there? How did they transport them? Why would they go to all that trouble?
Another theory arose in 2006. Some geologist think that these stones were transported by huge glaciers in the ice age. The people at Stonehenge just picked them up from closeby. Now that seems more credible to me.
For the New Glacier Theory here.
