That process, which involves stacking timber and smothering it under turf or earth to restrict oxygen, leaves behind a distinctive scorched signature in the soil, one that can survive for a thousand years without anyone noticing it is there. At Island Mcteige, such a signature did survive, quietly preserved beneath the surface until archaeologists eventually came looking.

The site, designated Site 3C during excavation, was investigated by archaeologist Nikolah Gilligan under licence reference 08E0998. A radiocarbon date obtained from the remains placed the activity firmly in the early medieval period, calibrated to between 961 and 1020 AD (laboratory reference UBA 11555). That date range puts this charcoal-making episode in a period of considerable activity across Ireland, when monastic economies, small-scale ironworking, and rural settlement were all creating demand for reliable fuel sources. Charcoal burns hotter and more consistently than raw wood, making it essential for metalworking in particular, and its production was a recognised craft in early medieval Ireland rather than an incidental activity. The record was compiled by Denis Power and uploaded to the excavations.ie database in August 2012.

Island Mcteige is not a place with a visitor infrastructure built around it, and the charcoal site itself would offer little to the eye without specialist knowledge of what disturbed or discoloured soil can indicate. The significance here is less visual than conceptual: a small, functional, working site that fills in the ordinary economic texture of early medieval life in Limerick, the kind of activity that rarely makes it into the historical record but that underpinned almost everything else. Those interested in early medieval landscape archaeology in the region would find the excavations.ie entry a useful starting point for locating the site in its broader archaeological context.