The Preseli ice cap

 

I found the above reconstruction in an old (2014) article in "Current Archaeology" by Tim Darvill and Geoff Wainwright.  They were not, of course, at all interested in the past existence of  Preseli ice cap -- but it happens to show pretty well what its dimensions might have been on several occasions during the Ice Age.  I suspect that there might have been more extensive ice on the north flank of the main upland ridge, and more in Cwm Cerwyn, close to the summit called Foelcwmcerwyn -- but you get the general idea.

Ignore the marked sites -- they simply show archaeological sites that were of interest to the authors of the article.

The small ice cap (which MUST have existed) is still somewhat mysterious -- and I am still trying to work out whether it had a role in carrying spotted and unspotted dolerite erratics NORTHWARDS down towards the valley of the Afon Nyfer.  There are too many of them dotted about in the landscape  -- mostly big irregular shaped boulders of no use as monoliths or gateposts -- to suggest that they have been carried by human beings.  I am still on the case....... and as readers might recall, I have been changing my mind rather often on the matter of the erratic "cluster" near Glan yr Afon!