Turin R.C. Chapel, recorded on the 1838 Ordnance Survey six-inch map, was built directly into the eastern quadrant of a platform ringfort, the kind of circular raised enclosure that was a common form of defended settlement in Ireland from roughly the early centuries AD through to the Norman period. The overlap of these two structures, separated by perhaps a thousand years of use, is the kind of accidental layering that Irish landscapes accumulate without drawing attention to itself.

The ringfort at Tevrin sits on a natural rise in the ground, with a stream running some thirty-five metres to the south, marking the townland boundary with Killynan. Within the earthwork's interior, archaeologists have identified traces of four possible hut sites, the slight surface irregularities that represent the ground plans of timber or wattle structures long since collapsed and absorbed into the soil. A square depression visible inside the bank in the northern quadrant may be a fifth. There is also what appears to be a collapsed souterrain, an underground stone-lined passage or chamber that was typically used in early medieval Ireland for storage or concealment. Whether the souterrain connects to the hut sites or predates some of them is unclear from what survives at ground level. The platform ringfort type, where the interior is raised above the surrounding terrain rather than simply enclosed by a bank and ditch, is considered a variant associated with higher-status settlements, though the evidence here is fragmentary.