Where the more familiar earthwork ringfort was formed by piling up soil and sod into a circular rampart, a cashel achieves the same enclosure in stone, a distinction that in the west of Ireland often reflects the sheer abundance of limestone close to the surface. These structures date broadly to the early medieval period, roughly 500 to 1000 AD, and served primarily as farmsteads, the enclosing wall protecting a family's home and livestock rather than functioning as a military fortification in any serious sense.

Cashels of this kind are scattered across the Burren and its fringes, where the geology made stone the obvious building material and where tillage was often impractical. Killeenan sits within that broader landscape tradition, a small townland carrying a monument that connects it to the patterns of early Irish rural settlement. The word cashel itself derives from the Irish caiseal, related to the Latin castellum, and the term was applied to stone-walled enclosures long before it became associated with the famous Rock of Cashel in Tipperary. The Killeenan example represents the more everyday end of that spectrum, the kind of site that housed an ordinary farming household rather than a king or bishop.