Stones traveled some 160 miles from Wales by as yet unknown means
Thanks to a team of geologists in the U.K., we now know where the oldest rocks in Stonehenge came from. According to Robert Ixer of the University of Leicester and Richard Bevins of the National Museum of Wales, the famous monument's inner circle of stones originated in a quarry 160 miles away in Pembrokeshire, Wales. In contrast, the larger, more recently added outer stones, are believed to have come from about 20 miles away. So, we know the where, but the question of how remains.
The geologists estimate that the rock was transported from Pembrokeshire to Stonehenge some 5,000 years ago, but scientists have yet to determine the means employed. In fact, they believe it's possible that the stones weren't carried by humans at all, but rather by a shifting glacier during the last ice age.
Ixer and Bevins used a process called petrography to painstakingly compare the crystalline mineral structure of rock samples from the Welsh location to Stonehenge's ancient bluestone circle andRead More »from Secrets of Stonehenge: Scientists find origin of central rocks