The hollow worn into its upper surface, roughly thirty centimetres across, is the mark left by generations of grinding grain by hand. This type of tool, known as a saddle quern, is one of the oldest food-processing implements found in Ireland, worked by pushing a smaller stone back and forth across the curved depression to crush cereal into flour. That it remains partially embedded in the inner face of the bank, apparently left where it lay, gives the site a quietly domestic quality that larger, more celebrated monuments rarely convey.

The earthwork itself is a rath, the most common type of ringfort in Ireland, typically a circular enclosure defined by an earthen bank and external ditch, used as a farmstead during the early medieval period, roughly between the fifth and twelfth centuries. At Ballyadeen, the enclosure measures approximately thirty-three metres east to west and twenty-seven metres north to south, making it a fairly modest example. The bank survives to only about twenty to twenty-five centimetres in height, and the external fosse, the shallow ditch that would have reinforced the boundary, is now barely perceptible at around ten centimetres deep. What survives of the line is partly absorbed into a later earthen field boundary, which appears to follow and perhaps incorporate the original bank. Material from field clearance has been piled against both sides of that boundary within the enclosure area, which has blurred the original profile further. The site sits on a gentle south-facing slope, now under pasture, the kind of quietly unremarkable agricultural land that conceals early medieval occupation across much of Munster.