It is a fulacht fia, a type of prehistoric cooking site found in great numbers across Ireland, typically identified by a horseshoe-shaped mound of fire-cracked stone beside a trough or pit. The Ballinguilly example is notable less for anything dramatic and more for what it illustrates about how such sites survive: waterlogged, inaccessible ground that would have made the site awkward to work has also helped preserve it from disturbance.

The mound was recorded as recently as a 1943 Ordnance Survey six-inch map, appearing simply as an undifferentiated earthwork before its nature was established. The site had previously been noted by Hartnett in 1939, placing it within an early wave of systematic attention to fulachtaí fia in Cork. These sites are generally understood to date from the Bronze Age, though many remained in use across different periods, and their precise function has been debated, with cooking, brewing, and bathing all proposed by archaeologists over the years. The Ballinguilly mound fits a familiar pattern: close to water, low-lying, and easy to overlook.