That absence is itself telling. Mayo is a county thick with earthworks of various kinds, from prehistoric burial mounds to early medieval ringfort platforms, and without closer investigation it is rarely possible to say from the name alone which tradition a given mound belongs to.

Mounds of this kind in the west of Ireland can belong to almost any period. Some are Neolithic or Bronze Age funerary monuments, constructed to cover burials and mark territory. Others are the eroded remains of mottes, the raised earthen bases of early Norman timber castles, or the collapsed cores of ringforts whose outer banks have long since been ploughed or grazed away. The townland name Carrowbeg comes from the Irish An Ceathrú Bheag, meaning the small quarter-land, a unit of land division that itself speaks to a deep history of organised settlement in the area. That a mound survives here at all, named and mapped and formally recognised, suggests it retains enough physical presence to have caught the attention of those who recorded it.