Derryvree’s Periglacial Fen
Archived: 7 October 2026
Although 30,143 BCE is a modern, imprecise conversion, Derryvree, County Fermanagh, provides Ireland’s strongest evidence for conditions within this later Pleistocene interval. Freshwater sediments, dated broadly to 36,900–31,700 calibrated BP, lay between glacial tills, recording open water, marsh, tundra vegetation and severe periglacial climate before renewed ice advance. Castlepook Cave, County Cork, preserves a mixed fauna including mammoth, reindeer, giant deer, predators and smaller cold-adapted animals, demonstrating ecological links beyond Ireland. No secure human settlement is known. A possibly cut-marked reindeer bone suggests brief human presence, but remains uncertain. Together, sites reveal regionally varied, unstable environments, not fixed political history.
