It has a place in the official inventory of Irish heritage sites without, at present, any accompanying detail about what it looks like, how large it is, whether it shows signs of human use, or what period of history, if any, it might be connected to.

Caves in the Irish archaeological record occupy a broad and often surprising range of categories. Some were used as seasonal shelters during the Mesolithic or Bronze Age; others served as places of burial, as animal dens that preserved bones long enough for later excavation, or as natural features later woven into local folklore and place-name traditions. The Burren region of County Clare, not far from Galway, contains some of the best-documented examples, but cave sites are scattered across the country wherever the underlying limestone has dissolved into voids over millennia. Whether the Tullagh cave belongs to any of these traditions, or whether it is simply a natural feature that earned its way onto the monument record by virtue of its presence in the landscape, is not currently known from available public information.