fitzcoraldo wrote:
First impressions would lead me to suspect that this photo
http://smg.photobucket.com/albums/v239/slumpy_uk/walderslade%20woods/?action=view¤t=moto_0042.jpg
may possibly give a clue to the origin of the ring and indicate weathering as opposed to carving as the cause
Precisely the reason I included it! It looks like successive bouts of water/pebble erosion has taken place, leaving a stepped cone.http://smg.photobucket.com/albums/v239/slumpy_uk/walderslade%20woods/?action=view¤t=moto_0042.jpg
may possibly give a clue to the origin of the ring and indicate weathering as opposed to carving as the cause
cheers fitz
However, the main ring certainly doesn't look like that, and although it does use existing cracks or grooves in the stone, I can't see how it would possibly have been done naturally.
