Maguirebridge’s Intertill Marsh
Archived: 26 September 2026
Around 30,655 BCE, Ireland experienced a cold, unstable Late Pleistocene interval rather than a recordable historical year. At Derryvree near Maguiresbridge, freshwater silts and organic deposits between till beds show a marsh developed between glacial advances. Mosses, sedges and northern insects indicate open, treeless wetland and tundra conditions, despite severe seasonality. Ice margins, sea levels and coastlines changed regionally, repeatedly eroding earlier landscapes. Castlepook Cave’s Ice Age fauna includes reindeer and mammoth. A marked reindeer bone may indicate human butchery, but cannot demonstrate settlement. Evidence supports occasional mobile visitors within a varied, harsh glacial environment, not a permanent Irish population.