These are the traces of boundaries, lazy beds, and enclosures that predate any living memory of the place, stone laid against stone to divide ground that has long since been abandoned to bog and rough grass.

Slievemore is already known for its deserted village, a long street of roofless stone cottages whose occupation stretched from at least the early modern period into the nineteenth century, when the effects of famine and later clearances emptied it for good. The field system on the mountain slopes is bound up with that same landscape of habitation and departure. Field systems of this kind are common across the west of Ireland, where communities worked marginal land through centuries of effort, throwing up earthen banks and dry-stone walls to create plots workable enough for oats, potatoes, or seasonal grazing. On Achill, the scale of what remains across Slievemore suggests a settlement history considerably older than the visible village, with some archaeological work in the area pointing to activity stretching back through the medieval period and beyond into prehistory. The mountain, in that sense, holds several eras of land use folded into one another, legible to the careful eye but easy to overlook from a distance.