Maguiresbridge’s Milfoil Basin
Archived: 26 September 2026
At roughly 30,637 BCE, Ireland was in the climatically unstable Marine Isotope Stage 3, not a period with precise calendar dating or written history. At Derryvree near Maguiresbridge, freshwater sediments between glacial tills preserve mosses, sedges and water-milfoil, indicating treeless, cold wetland habitats during an interval of local ice retreat. Comparable Fermanagh deposits confirm environmental oscillation. Southern caves contain diverse cold-stage fauna, including reindeer, mammoth and predators, though deposits cannot date species to one moment. A cut-marked reindeer bone from Castlepook may indicate early human activity, but no settlement is known. Evidence instead reveals life amid advancing and retreating ice.