doon hill fort (which is not a dun), capenoch croft, west of barnbarroch, occupies a rocky knoll from which the ground falls away steeply to the e. around the rim of the knoll there is the remains of a substantial stone wall, enclosing an area some 34.0m ne-sw by 30m transversely. the entrance, 4.0m wide, is in the sw. there is a ditch around the base of the knoll, except on the e, where there are steep slopes. it has been cut through living rock to the e of the entrance, and there are traces of a counterscarp bank on the nw.