This is a fulacht fia, one of the most common prehistoric monument types in Ireland and yet still one of the least understood. The term refers to a mound or spread of fire-cracked stone, typically horseshoe-shaped, found beside a water source. The broadly accepted theory is that these sites were used for cooking, possibly by heating stones in a fire and dropping them into a water-filled trough to bring it to the boil, though other proposed uses include bathing, brewing, and textile processing. Whatever their purpose, they appear in their thousands across the Irish landscape, concentrated especially in the south and west.

The Knockbarry example sits immediately to the north-east of a well, which fits the pattern neatly. Water proximity is almost a defining feature of fulachta fiadh, and their association with natural springs and wells is well established. A second possible fulacht fia has been recorded roughly 300 metres to the north-east, suggesting that this corner of North Cork saw repeated or sustained activity at some point in prehistory, most likely during the Bronze Age, when the majority of these sites were in use. The clustering of two such features within a short distance of one another is not unusual; some areas seem to have accumulated them over generations, each new mound of spent stone accumulating beside or near an older one.