Carburrow propped stone

A huge stone (approx 3m x 1.5m x 1m) definitely propped by a boulder and a smaller stone. On the southern part of Bodmin moor.
There is sideways contact with a large adjacent stone that is itself propped.
The cavity underneath seems to be the result of manipulation and removals.
A stony bank runs straight up the hillside to the feature and then on to the burial cairn beyond. It is hard to conceive of a natural sequence of events that could have produced this arrangement.