It has been discovered by two local children in the 1960s who have unearthed two stone axes.
Originally supported on 6 upright portals, 2.3 metres high. The capstone is estimated to weigh twenty-four tonnes. The portal stone supporting the back of the capstone has collapsed, allowing the capstone to slide backwards out of position, causing the doorstone to collapse also. The capstone now rests at a 45-degree angle
It is thought that these tombs, of which over 1,200 have been identified in Ireland were either the burial place of a single important king or chieftain or perhaps the tombs of several members of a tribe who inhabited the area in the Neolithic era.