Julian Cope presents Head Heritage

A repeat plea re the circle within a circle within a circle I've found - apparently the technical term is a concentric circle. I know that there are examples of upright stone circles in UK with this formation, but does anyone know of another site where the stones are small and do not protrude out of the turf by more than a few inches? Any idea of the purpose of these circles, whatever the size of their components? The one I have found is overlooked on its eastward side by a rock outcrop - with an also it seems similarily unrecorded degraded triple bank fort surrounding it - and therefore does not have a complete view of the night sky. I would like to add this site to TMA for comment, and have photographs. Regards, Puzzled of Sheffield.