Maguirebridge’s Coldwater Ledger
Archived: 30 September 2026
About 30,451 BCE, a modern label rather than a precise Irish date, Ireland experienced a cold Late Pleistocene interval. At Derryvree near Maguiresbridge, freshwater sediments between glacial tills record an ice-free phase before the Last Glacial Maximum. Pollen, plants, insects and sediments indicate tundra-like wetlands with shallow water, sedges, grasses, juniper and arctic-alpine species. Later ice buried this evidence. Castlepook Cave in Cork preserves diverse cold-stage fauna, including mammoth, reindeer, hyaena and Arctic fox, although remains span time. A possibly cut-marked reindeer bone suggests brief human presence, not settlement. No evidence supports contemporary polities, villages, trade, rituals or calendar-dated events.