Derryvree’s Thaw Pulse
Archived: 26 September 2026
At 30,625 BCE, Ireland lay within the climatically unstable Marine Isotope Stage 3. Derryvree in County Fermanagh preserves freshwater sediments deposited during an ice-free interval, later sealed by glacial deposits. Pollen, plants, mosses and insects indicate a cold, treeless, periglacial wetland with sedges, pools and Arctic-alpine vegetation. Its broad radiocarbon range encompasses the nominated date but cannot identify a specific year or climate event. Ireland’s variable ice margins and North Atlantic climate permitted temporary ecological opportunities before major glaciation. Cave fauna document cold-stage mammals, while a possibly butchered reindeer bone suggests, but does not prove, fleeting human presence or settlement.