Caherconnell is a large and perfect fort 140-145 feet in external diameter, nearly circular in plan. It is 12 feet thick and from 6-14 feet high. The masonry consists of large blocks many 3feet long and 2ft. 6in.high. The inner face is almost perfect.’ Archaeology of the Burren: Prehistoric Forts and Dolmens in North Clare – Thomas Johnson Westropp. Caherconnell Stone Fort, situated 1km south of Poulnabrone dolmen in the heart of the Burren Ireland , offers you the opportunity to visit an exceptionally well – preserved example of the stone forts or stone ringforts, which are to be found in the Burren Ireland..