This is a fulacht fia, a type of ancient cooking site, typically Bronze Age in date, where stones were heated in a fire and then dropped into a water-filled trough to bring it to the boil. The crescent or horseshoe shape of the mound is characteristic of the type, formed from the accumulated heap of fire-cracked and discarded stones built up over repeated use.

The mound at Knockuragh measures roughly 6.5 metres along its longer axis and 4.75 metres across, best preserved on its western and north-western sides, where it still reaches about 0.45 metres in height. Towards its eastern end the profile drops to around 0.15 metres, and the arms of the crescent are truncated at both the south-west and north-east. The trough itself, the wooden or stone-lined pit that would have held the water, has not survived as a visible feature, but its probable opening faced south-westward. The site does not stand in isolation. A second fulacht fia lies just 1.5 metres to the south-south-west, close enough that the two may once have been conjoined, and a further example sits roughly 20 metres to the north-north-east. The clustering of these sites around a single stream is entirely typical; a reliable water source was the essential requirement, and many fulachta fia are found in low-lying, seasonally wet ground precisely like this.