BIRM-166’s Fossil Pool
Archived: 22 September 2026
At 30,887 BCE, Ireland’s history can only be reconstructed through environmental evidence, not annual events. Derryvree, County Fermanagh, preserves freshwater sediments between glacial tills, dated broadly to an interval encompassing this year. Its pollen, plants and insects reveal open, cold tundra-like wetlands with sedges, mosses, bogbean, dwarf willow and seasonal meltwater. Castlepook Cave, County Cork, documents a wider MIS 3 fauna including mammoth, reindeer, giant deer, wolves, hyaenas and Arctic foxes, though its deposits are chronologically mixed. A potentially cut-marked reindeer bone suggests human presence, but no secure contemporary settlement exists. Ice conditions, habitats and connections changed continually over millennia.