Derryvree’s Unsettled Waters
Archived: 25 September 2026
At approximately 30,702 BCE, Ireland lay within the unstable later Marine Isotope Stage 3 of the last Ice Age, although the date cannot identify a specific event. Derryvree, County Fermanagh, preserves freshwater sediments and cold-adapted wetland plants between two glacial tills, demonstrating temporary ice-free, tundra-like conditions. Castlepook Cave, County Cork, records diverse fauna, including mammoth, reindeer, giant deer, bears, wolves and hyaenas, indicating intermittent ecological connections with Britain and continental Europe. Ice, sea levels and animal ranges changed dynamically. No securely dated evidence proves human occupation, society, ritual or trade in Ireland then; the record documents environmental change and limits.