Thom calls this flattened circle 'Black Marsh' - though a Google search doesn't chuck up much using those terms so he probably had the name wrong. His 1960's survey shows four or five stones still standing.

The upright central stone has a flat edge to its northern face. If you looked down that side of the stone, the holed stone is aligned on the western perimeter - probably lost in the turf. Looking easterly along that same stone face are what seems to be a pair of portal stones making an entranceway - perhaps.

It's funny how Thom's Megalithic Yard has disappeared.

david