Where are the "semi dressed " stones and quarries in the Preseli area ?
I can't remember where I saw the ready-dressed stone by the Preseli quarry, but it was in the last month probably on the internet. There were two archaeologists posing by it, with a caption stating the fact. It was recent material. If I can remember, or find the source, I will re-post and let you know. It convinced me.
As for glaciation, well, it's ok to say glaciation reached the edge of Salisbury Plain, but it also relies on the flow. i.e. the flow towards the site of Stonehenge and its environs needs to come from the Preselis. What we need to know is whether it did. I'm no expert, but have read a bit about it, and find it hard to picture a glacier flowing from the coast to inland. In other words I can't see how glaciation could have transported bluestones nearer to Stonehenge than their origin is today, if the only natural source is from the Preselis.
It's an interesting debate.
All the best,
TE.
The glacial theory depends on the Irish sea glacier entraining the rocks at Preseli and and depositing them somewhere around the Somerset levels i.e. the movement need not be unidirectional and the Somerset levels is the eastern extent of the glacier . Of course just because the glacier was capable of doing so doesn't mean it did .
