It carries no confirmed date, no attributed builder, and no period assignment beyond the deliberately vague category of "indeterminate". That designation is not laziness on the part of those who record such things; it reflects a genuine archaeological uncertainty, the kind that arises when a structure has left too faint an impression on the landscape, or perhaps too ambiguous a one, to be confidently placed in any century.

An Cheathrú Gharbh lies in County Mayo, a county whose western reaches contain an unusually dense concentration of surviving vernacular and pre-modern structures, many of them poorly documented. The "rough quarter" of the name suggests marginal land, ground that was worked or settled under pressure rather than by preference, the kind of place where people built what they could from what was available and left behind walls that do not always conform to the patterns that make dating straightforward. Without further detail about the structure's fabric, its relationship to other features in the landscape, or any associated finds, it remains one of many quietly unresolved entries in the archaeological record of rural Connacht.