In a pasture near the townland boundary with Ballynagoul, a prehistoric cooking site was fully excavated and then quietly reclaimed by the land, leaving no visible trace above ground. No marker flags it, no earthwork survives, and satellite imagery shows only grass.

A fulacht fia, sometimes called a burnt mound, is among the most common prehistoric monument types in Ireland. The typical form involves a horseshoe-shaped mound of fire-cracked stone and charcoal-rich soil, built up over repeated use of a water trough into which heated stones were dropped to boil water, most likely for cooking. The site at Garrynderk North came to light not through field survey but through pipeline construction, when the Bruff-Mallow gas pipeline cut through the area in the 1980s. Archaeologist Margaret Gowen excavated it in 1986, and her findings were published in 1988, with the monument recorded as site 1/5/4 in that report. The location fits a pattern well established across Irish prehistory: fulachta fia are consistently found close to water sources, and this one sits just 10 metres west of a stream. An excavated hearth was uncovered 5 metres to the south-west, suggesting activity across a small but concentrated area. Within a short distance, the landscape holds further layers of settlement history: a ringfort, the remains of a circular enclosed farmstead typical of early medieval Ireland, lies 110 metres to the south-east, and a moated site, a later medieval enclosure usually associated with Anglo-Norman settlement, sits 165 metres to the east.

The site does not appear on Ordnance Survey Ireland historic mapping, and since excavation has removed the physical monument, there is nothing to observe on the ground today. Its interest lies less in what can be visited than in what the record tells us: that this unremarkable patch of Limerick pasture was in active use across several distinct periods, each leaving its own kind of mark, most of which have now either vanished beneath the soil or been lifted out of it entirely.