Hi Mazzareth, Glad you have a good walk, have you been up Solsbury Hill? if you look back to Bathampton Down you can see what I suppose are called 'celtic field' boundaries, have a photo somewhere but its not really stones...
Just discovered this below, (the three Suleva are in the museum, also have a photo of that)
When you come to a crossroads you're on the site where the stone carving of the 3 Sulevae (3 mothers) was discovered - Romano British but maybe marking an ancient shrine to Sul?