Maguiresbridge’s Frostwater Basin
Archived: 5 October 2026
Around 30,219 BCE, Ireland has no recoverable annual history, but Derryvree near Maguiresbridge, County Fermanagh, preserves important environmental evidence. Organic freshwater sediments, radiocarbon dated broadly between about 34,950 and 29,750 BCE, lie between tills, demonstrating a local ice-free interval before renewed glaciation. Plant and insect remains indicate shallow water, wet margins and open, treeless, Arctic-alpine vegetation under severe periglacial conditions. Other sites suggest Ice-Age mammals occupied parts of Ireland, though dates and assemblages require caution. No secure evidence establishes human settlement, society or activity then. Derryvree instead records a temporary cold wetland later buried by advancing ice during later glaciation.