Derryvree’s Sedges Before Ice
Archived: 5 October 2026
Around 30,259 BCE, Ireland lay within the climatically unstable Late Pleistocene, but precise annual dating is impossible. At Derryvree, County Fermanagh, freshwater organic sediments between glacial tills preserve evidence of a temporary wetland during Marine Isotope Stage 3. Sedges, mosses, aquatic plants and insects indicate cold, open, tundra-like ground with seasonal pools, not woodland. Castlepook Cave fauna, including mammoth, reindeer, giant deer and predators, demonstrates varied Pleistocene ecosystems, though not their presence at Derryvree simultaneously. A possibly tool-marked reindeer bone may signal an early human visit, but proves neither settlement nor occupation. Later ice expansion reshaped and erased these landscapes.