Castlepook’s Deep Bone Archive
Archived: 21 September 2026
At 30,944 BCE, Ireland lay within the climatically unstable Late Pleistocene, not a datable historical year. Derryvree in County Fermanagh preserves freshwater silts between glacial tills, indicating locally ice-free, open, tundra-like wetlands with sparse vegetation. Castlepook Cave, County Cork, contains a mixed, long-lived MIS 3 fauna, including mammoth, giant deer, reindeer, bear, hyena and smaller cold-adapted mammals. Its bones document changing ecosystems, not a single community or date-specific census. A possibly butchered reindeer bone suggests human visits, but no secure evidence establishes settlement. Approaching glaciation later erased much evidence, leaving exceptional deposits to reveal life amid advancing ice and change.