Marked on the 2nd edition Ordnance Survey 6-inch map, this ancient monument has since vanished from the landscape, though its memory lingered for years in the subtle bend of a field fence that traced its former outline. The site occupied a north-facing slope with commanding views across the valley, prime grazing land that has been farmed for generations. Local records mention a bullaun stone, a type of boulder with a depression often used for grinding or ritual purposes, reportedly located in a nearby field, though recent surveys have failed to locate it.

The area’s archaeological significance prompted careful investigation when development threatened in 2006. Archaeologist Eoghan Kieran conducted test excavations just 60 metres north of where the enclosure once stood, ahead of plans to build five houses at Dooish. Eight trenches were methodically dug across the development zone and extending southward, searching for any traces of ancient occupation or activity that might have been connected to the vanished monument.

Despite the proximity to the former enclosure site and the area’s recognised archaeological potential, the excavations revealed nothing but consistent soil layers throughout; no pottery shards, no post holes, no hearths or ditches that might have told us more about who built Cashelnagat or how they lived. The absence of findings doesn’t diminish the site’s importance in understanding Donegal’s ancient landscape, where monuments like these served as focal points for communities whose stories are written more in earth and stone than in any surviving documents.