BIRM-166’s Tundra Witness
Archived: 17 September 2026
At the nominal date of 31,425 BCE, Ireland lay within the climatically unstable Marine Isotope Stage 3. Derryvree sediments in County Fermanagh, dated broadly to this period, record ice-free freshwater wetlands and open tundra vegetation amid severe periglacial conditions. Later glaciation preserved these deposits beneath till. Castlepook Cave in County Cork contains a Late Pleistocene fauna, including mammoth, reindeer, giant deer, predators and scavengers, demonstrating ecological links with north-west Europe. A marked reindeer femur may show stone-tool butchery around 31,000 BCE, potentially indicating brief human presence. However, insecure context and limited evidence preclude claims for settlement, society, culture or events.