That designation alone suggests the cave is more than a routine hollow in the limestone; caves in Ireland have served many purposes across the centuries, from natural shelters and places of refuge to sites associated with ritual deposit or folklore, and the fact that this one carries monument status places it in that broad and varied company.

Beyond its classification, the available detail on this particular site is sparse. What can be said is that County Mayo sits largely over carboniferous limestone in its central and eastern stretches, geology that lends itself to cave formation through the slow dissolution of rock by slightly acidic groundwater over millennia. Caves in such landscapes sometimes yielded animal bones, occasional human remains, or objects deposited deliberately, and Irish examples have produced finds ranging from the prehistoric to the early medieval period. Whether Carrowneden's cave falls into any of those categories remains unclear from what is currently on record.