The ring-barrow near Glennascaul was not dramatic in scale, but it was precise in its construction: a small flat-topped mound at the centre, ringed by a fosse (a shallow surrounding ditch) and then an outer bank, the whole assembly measuring just over ten metres across. At the north-east, there was a gap in the earthworks roughly two metres wide, with faint traces of a causeway crossing the ditch, suggesting a deliberate entrance into the enclosure. Such monuments are generally associated with Bronze Age funerary practice, their concentric earthwork arrangement thought to demarcate a burial space from the ordinary landscape around it.

The barrow came to official attention not through ground survey but from the air. Markus Casey identified it during aerial reconnaissance, and a physical inspection followed in February 1992, at which point the monument was recorded as fairly well preserved. The central mound stood between thirty and forty centimetres high; the encircling ditch was up to one and a half metres wide; the outer bank added another ring of modest but measurable earthwork. A scatter of large, loosely placed boulders to the south of the monument appeared to be field-clearance material, the kind of casual stacking that happens when farmers move rocks off working land, and which often accumulates around older earthworks without any deliberate intention. What happened after 1992 is harder to account for. Later aerial imagery shows that the surrounding area was developed as a large quarry, and the ring-barrow appears to have been levelled in the process, leaving no visible trace where a Bronze Age burial enclosure once sat on its gentle ridge.