Does that arrow place it just off to the east on this plan?
http://www.themodernantiquarian.com/post/17265
Or is it one of the things marked on the plan as a possible prehistoric feature. There are a couple of little circular things marked on it about 1km east of the circle. I can't quite get my head around where the plan fits onto the map.
Ike, this is a dead nice photo :
http://www.themodernantiquarian.com/post/35197