At Castlelands in County Cork, that is precisely what happened when topsoil stripping began in advance of the Ballincollig-Ballineen pipeline, revealing what archaeologists identified as a possible burnt mound, one of the most common yet least-celebrated prehistoric site types in Ireland.

A burnt mound is essentially the debris of repeated heating, typically associated with cooking or industrial processes in the Bronze Age. Water would be boiled by dropping fire-heated stones into a trough, and the cracked, spent stones were discarded into a characteristic horseshoe-shaped heap nearby. The Castlelands example was archaeologically tested in 2000, and what the excavators found was modest but telling: a narrow band of fractured stones and charcoal-enriched soil, extending roughly 1.5 metres from the northern edge of the pipeline corridor and lying about 0.4 metres deep before meeting undisturbed sterile soil beneath. No features were cut into the subsoil, which means the trough or pit that might have anchored the activity was not found within the tested area. That absence has an explanation: the deposit appears to thin out at the field boundary, suggesting the bulk of the mound lies untouched in the field to the north, beyond the pipeline's reach. Ploughing over the years had likely dragged some material southward into the corridor. A second possible burnt mound was identified and excavated roughly 110 metres to the west during the same pipeline project, which hints that this stretch of Cork farmland saw repeated, sustained activity at some point in prehistory.