Derryvree’s Intertill Lake
Archived: 25 September 2026
Approximately 32,650 years before present, Ireland lay within the unstable Late Pleistocene climate of Marine Isotope Stage 3, not a recoverable historical year. At Derryvree, County Fermanagh, freshwater sediments between glacial tills, dated broadly to 36,900–31,700 calibrated years BP, record an ice-free interval. Plant and insect remains indicate treeless, periglacial tundra with wetlands, pools and sparse Arctic-alpine vegetation. Other Fermanagh deposits confirm varied local conditions amid shifting ice. Castlepook Cave preserves evidence of diverse cold-climate fauna, though species did not necessarily coexist. No evidence establishes permanent human occupation; a possibly butchered reindeer bone only suggests brief human presence. Uncertainty remains.