Castlepook’s Lone Toolmark
Archived: 23 September 2026
Thirty thousand years ago, Ireland lay within the unstable MIS 3 phase of the last Ice Age, not a precisely datable historical year. Derryvree, County Fermanagh, preserves freshwater sediments between glacial tills, indicating a cold, treeless, periglacial mosaic of wetlands, tundra vegetation and seasonal habitats. Castlepook Cave, County Cork, contains mixed Ice Age fauna and a reindeer femur possibly cut by a stone tool, potentially the earliest sign of human activity. The evidence cannot demonstrate settlement, hunting parties or social organisation. Later ice-sheet expansion probably destroyed many traces. This horizon therefore records demanding environments, animals, possible visitors, and archaeological uncertainty.