The Castlepook Reindeer Fragment
Archived: 18 September 2026
Abstract
Around 31,245 BCE, Ireland was an unstable MIS 3 Ice Age landscape, not a datable historical year. Open tundra, wetlands and intermittent ice supported reindeer, mammoth, giant deer, predators and other fauna, while changing sea levels and ice margins affected access. Castlepook Cave in County Cork preserves varied Pleistocene remains, including a reindeer femur fragment dated to about 33,000 years ago with a possible stone-tool cut mark. If confirmed, it may indicate an early human visit, but not settlement or continuous population. Environmental deposits at Derryvree and Aghnadarragh show cold, treeless habitats. Evidence remains fragmentary, requiring cautious interpretation by researchers.