British Irish Ice Sheet
Archived: 6 October 2026
Around 30,196 BCE, Ireland lay in the later Late Pleistocene, during Marine Isotope Stage 3, as the British–Irish Ice Sheet expanded but before its maximum. Conditions varied regionally: low sea levels altered coasts, while ice, meltwater and frost reshaped terrain. Derryvree, County Fermanagh, preserves evidence of treeless tundra-steppe wetland with cold-tolerant plants and freshwater pools between glacial phases. Castlepook Cave, County Cork, yielded remains of reindeer, mammoth, giant deer and predators, indicating open cold-country habitats. A cut-marked reindeer bone may indicate human butchery, but no secure settlement evidence exists. Ireland's record reveals changing environments, fauna, uncertain access routes, and ice.