North-South Wales at glacial speed
If you think travel between North and South Wales is painfully slow, spare a thought for the Porthlysgi boulder near St Davids. Its mineral composition is alien to Pembrokeshire but matches picrite found on the Llŷn Peninsula and Anglesey. It was transported ...
by glacial movement and is so distinctive it has been mistaken for a meteorite. It was once protected by an iron cage and is one of very few individual rocks to be named on OS maps since 1906. For more about the boulder, use your smartphone to scan the HistoryPoints QR codes beside the Wales Coast Path near Porthlysgi, or click here