BIRM-166’s Ice-Free Fermanagh
Archived: 7 October 2026
Around 30,165 BCE, Ireland’s history is reconstructed from deposits rather than annual records. At Derryvree, County Fermanagh, freshwater sediments between glacial tills show a locally ice-free, cold wetland interval during MIS 3, supporting tundra-like vegetation, insects and shallow-water habitats before renewed glaciation. This evidence does not establish island-wide conditions. Castlepook Cave, County Cork, preserves MIS 3 fauna including mammoth, reindeer, hyaena and giant deer, demonstrating changing animal communities. A possibly tool-marked reindeer bone may indicate human handling, but cannot prove settlement or continuous occupation. Ireland remained environmentally variable as the more extensive Last Glacial Maximum ice advanced over coming millennia.