It measures roughly 8.5 metres in length and 5.5 metres in width, with a central depression that hints at a collapsed interior. The feature is recorded as a possible clochan, a dry-stone corbelled hut of early medieval Irish tradition, where each course of stones projects slightly inward until the walls meet overhead without the need for mortar or timber. The tentative classification matters here: this is not a confirmed structure so much as a suggestive shape in the ground, asking to be read carefully.

The broader site, Dún Beag, provides the context. A further possible clochan, or perhaps a pair of conjoined examples, has been identified in the north-western quadrant of the same enclosure, suggesting that whatever domestic or monastic activity once took place here was not isolated to a single point. The area around Cill Mhuirbhigh, whose name references an early ecclesiastical foundation, was recorded and catalogued in Paul Gosling's Archaeological Inventory of County Galway, Volume I, published by the Stationery Office in Dublin in 1993, which remains one of the more thorough regional surveys of the west of Ireland's field monuments.