National Museum Reindeer Femur
Archived: 7 October 2026
30,150 BCE denotes an approximate late-Marine Isotope Stage 3 horizon, rather than a recoverable Irish year. Ireland experienced unstable cold conditions before maximum British-Irish ice expansion, with local ice-free intervals indicated by Crag Cave speleothems. Castlepook Cave, County Cork, preserves a fauna including reindeer, mammoth, giant deer, predators and tundra species, demonstrating open habitats. A National Museum reindeer femur, possibly cut by a stone tool and dated around 31,000–33,000 BCE, may indicate Ireland's human activity. However, disturbed context and explanations preclude proof of settlement. Glaciation and later landscape change destroyed evidence, leaving caves as archives of change and hunter presence.