Derryvree’s Between-Till Silt
Archived: 1 October 2026
Abstract
30,390 BCE is not a recorded Irish year but a modern label for an unstable later Pleistocene period within Marine Isotope Stage 3. At Derryvree, County Fermanagh, organic freshwater silt between glacial tills indicates an ice-free, cold wetland, though its radiocarbon age cannot provide a calendar date. Mosses, sedges, grasses and aquatic plants supported a sparse tundra ecosystem. Castlepook Cave fauna demonstrates intermittent links to wider cold-climate environments, but its species did not necessarily coexist. Human presence remains unproven: a possibly cut-marked reindeer bone suggests fleeting activity without settlement evidence. Ireland’s history is chiefly environmental: ice, water, plants and animals.