BIRM-166’s Asymmetric Uncertainty
Archived: 6 October 2026
30,217 BCE cannot identify a specific Irish event, as radiocarbon dates require calibration and retain broad uncertainty. Derryvree, County Fermanagh, records a cold, treeless wetland between glacial advances during Marine Isotope Stage 3. Ireland likely comprised uneven ice-free ground, wetlands, snowfields and expanding glaciers, while access routes remained uncertain. Castlepook Cave, County Cork, preserves diverse cold-stage fauna, though its disturbed deposits and revised dates demand caution. A modified reindeer femur may indicate exceptionally early human activity, but cannot prove settlement. No evidence supports named communities, political structures or sustained habitation. Ireland’s past is reconstructed from fragmentary environmental and faunal evidence.