The site, known locally as An Tard Donn in the townland of Droim Chon Cuais, sits atop marshy, heather-covered terrain that has likely reclaimed any traces of human habitation over the centuries. Whether this was a ringfort, a common defensive structure built throughout Ireland from the early medieval period, or another type of fortification remains unknown.

The absence of visible remains doesn’t necessarily mean the fort never existed; many Irish archaeological sites have been lost to time through natural erosion, agricultural activity, or the recycling of building materials by local communities over generations. The marshy conditions at Crockmore’s summit would have made preservation particularly challenging, as waterlogged soil can cause stone foundations to sink and wooden structures to decay completely. Local memory and place names often preserve knowledge of sites long after their physical traces have vanished, serving as important clues for archaeologists and historians.

This potential fort site was documented in the Archaeological Survey of County Donegal, compiled by Brian Lacey and his team in 1983, which catalogued field antiquities from the Mesolithic period through to the 17th century. While the fort remains unclassified due to the lack of physical evidence, its inclusion in local tradition suggests it played some role in the area’s history, perhaps serving as a defensive position, a status symbol for a local chieftain, or a gathering place for the community during times of conflict.