The Castlepook Femur Debate
Archived: 24 September 2026
Around 30,749 BCE, Ireland lay within the unstable climatic conditions of Marine Isotope Stage 3, supporting cold-adapted fauna but lacking a securely documented human population. Castlepook Cave, County Cork, preserves mixed remains of mammoth, reindeer, giant deer, hyaena and other animals, accumulated over long periods and subject to disturbance. A marked reindeer femur may bear a stone-tool cut, potentially indicating Upper Palaeolithic butchery and Ireland’s earliest human activity. However, no associated tools, hearths, settlements or human remains confirm this interpretation. Later glaciation destroyed much evidence. The bone remains important but provisional, suggesting a possible brief visit rather than permanent occupation.