Derryvree’s Arctic Pool
Archived: 24 September 2026
Labelled 30,726 BCE, this period cannot be dated precisely and is best understood through environmental evidence from MIS 3. At Derryvree, County Fermanagh, freshwater organic deposits between glacial tills record an interval of cold, treeless tundra-like terrain, with shallow water, marsh plants, mosses and Arctic-adapted insects. The site shows that Ireland was not continuously ice-covered, although advancing glaciers and unstable climates transformed landscapes. Castlepook Cave fauna indicates that mammoths, reindeer, predators and other cold-climate mammals reached Ireland. A possibly tool-marked reindeer bone raises, but does not prove, early human visits. No evidence supports settlement, political or cultural events in Ireland.