Surviving inner kerb stones.
The three large stones centre left are the only surviving inner kerb stones.
Here we see their inner faces and they are all very flat, they would have
formed a smooth inner wall bounding the internal space of the ring-cairn. The
foreground would have been free of the rubble seen above and would
have been a continuously walled space about 6.5m in diameter. Behind the three
stones (and the other inner kerbs) would have been a huge ring of
small boulders filling the 3.75 m space between the inner and outer kerbs.