9O'Kelly, Michael J. "Beal Boru, Co. Clare." Journal of the Cork Historical and Archaeological Society 67.205 (1962): 2.
According to the author, "a modern stone revetment was added sometime between 1893 and 1911," likely by the landowner at the same time that he planted the now mature forest of trees. Due to O'Kelly's commitment not to let his excavations disturb any of the trees, a group of post-holes associated with a partially collapsed wall could not be investigated to determine any potential structure they may have delineated.