Derryvree’s Glacial Seal
Archived: 5 October 2026
Abstract
Around 30,249 BCE, Ireland lay within the fluctuating MIS 3 cold stage, although the date can only be treated as a broad chronological label. At Derryvree, County Fermanagh, freshwater silts and organic deposits between two tills record a treeless tundra wetland during an interval between glacial advances. Mosses, sedges and aquatic life indicate harsh but locally ice-free, waterlogged conditions. Ice was expanding towards the Last Glacial Maximum, repeatedly reshaping landscapes and obscuring evidence. Southern caves preserve cold-adapted mammals, including reindeer and mammoth, while a possibly butchered reindeer bone suggests, but cannot prove, early human activity. No settlement history is recoverable.