Derryvree’s Interstadial Waters
Archived: 17 September 2026
Around 31,483 BCE, Ireland lay within the climatically unstable Late Pleistocene, but evidence cannot define a single year or permanent human population. At Derryvree, County Fermanagh, freshwater sediments between glacial tills record an ice-free interval, broadly dated to 34,950–29,750 BCE, with cold, treeless wetlands, mosses, sedges and diverse local habitats. Cave formations and faunas indicate fluctuating conditions and episodic animal movements, including reindeer, mammoth, giant deer, bears and hyaenas. A marked reindeer bone from Castlepook Cave may indicate Upper Palaeolithic human processing, but remains unconfirmed. Ireland’s record documents shifting ice, environments and ecological opportunities, not settlements, politics or sustained occupation.