BIRM-166’s Thawline
Archived: 21 September 2026
30,912 BCE denotes an imprecise Late Pleistocene interval in Ireland, rather than a recoverable historical year. Derryvree, County Fermanagh, preserves freshwater deposits between glacial tills, indicating locally ice-free, cold, treeless wetlands during MIS 3. Radiocarbon calibration places the BIRM-166 deposit across a broad range encompassing this date. Plants, insects and sediments reveal varied periglacial habitats, while southern caves contain fragmentary remains of reindeer, mammoth, giant deer and predators. A possibly tool-marked reindeer bone suggests occasional human contact, not proven settlement. Changing ice, sea levels and later glaciation reshaped landscapes and obscured evidence, leaving a dynamic, chiefly environmental, not social, history.