Where the more common ráth was raised from heaped soil and sod, the cashel was constructed from whatever stone lay close to hand, its circular wall enclosing a domestic space that would have housed an early medieval farming family, their animals, and whatever small store of wealth they had managed to accumulate. Cashels of this kind are found across Ireland wherever stone is plentiful, and the west of Mayo, with its rocky, glacially worked landscape, offered builders plenty of raw material.

Beyond its classification and its location, the particular history of this cashel at Gortnafolla remains, for now, difficult to pin down with any precision. No specific dates of construction, no associated finds, no named families or recorded events can be attached to it from what is currently available. What can be said is that ringforts as a class were built and occupied broadly between the early centuries of the first millennium and the coming of the Normans in the twelfth century, and that cashels in the west of Connacht often represent some of the most durable physical traces of that long, largely undocumented period of rural Irish life. The walls of a well-preserved cashel could stand for a thousand years without anyone needing to repair them, which is precisely why so many survive in landscapes that have otherwise changed beyond recognition.