The mound is believed to be a fulacht fia, a type of prehistoric cooking site found in enormous numbers across Ireland, typically dating from the Bronze Age. The usual form is a horseshoe-shaped spread of burnt and shattered stone surrounding a trough that would have been filled with water, then heated by dropping fire-cracked rocks into it. Thousands of these sites survive across the country, often appearing in the landscape as nothing more than a slightly raised, dark patch of ground. This one, however, remains officially uninspected.

What is known about the Glencollins site comes entirely from cartographic evidence. It appears as a mound on the Ordnance Survey six-inch map surveyed in 1937, which is itself a modest kind of record, a dot and a symbol in a grid square, suggesting the feature was visible and noteworthy enough to mark at the time. When surveyors later attempted to inspect the site on the ground, the landowner declined to grant access. The mound therefore sits in a curious administrative and archaeological limbo: recorded but unverified, mapped but unexamined. It may be a fulacht fia, or it may be something else entirely. Without permission to look, no one can say.