Derryvree’s Permafrost Wetland
Archived: 21 September 2026
At the notional date of 30,942 BCE, Ireland lay within the climatically unstable Late Pleistocene, not a precisely documented year. Derryvree, County Fermanagh, preserves freshwater sediments dated broadly to this period between glacial tills, proving local ice-free conditions but not island-wide deglaciation. Its plants, insects and sediments indicate a treeless, tundra-like wetland shaped by permafrost, meltwater and seasonal thaw. Crag Cave records milder intervals through stalagmite growth. Cave fauna, including mammoth, reindeer and hyaena, demonstrates intermittently viable open habitats. A possibly cut-marked reindeer bone suggests fleeting human presence, but neither settlement nor permanent occupation is established. Later ice obscured evidence.