Maguirebridge’s Tundra Interval
Archived: 4 October 2026
30,267 BCE is not a recoverable Irish year but falls within a broad Marine Isotope Stage 3 interval. At Derryvree, County Fermanagh, freshwater organic sediments between glacial tills, radiocarbon dated to about 30,500 BP, record an ice-free tundra basin with sedges, mosses, aquatic plants and sparse arctic-alpine vegetation. Later ice advance reshaped the region, though Ireland was not uniformly glaciated. Southern cave assemblages, notably Castlepook, attest cold-adapted mammals, including reindeer and mammoth, across a wider timespan. A possibly tool-marked reindeer bone suggests an unconfirmed human visit, but no evidence supports settlement, polities, or sustained occupation. The period’s history is environmental.