Related Archive: Frozen Ground

Maguiresbridge Under Permafrost

Archived: 21 September 2026

Abstract

At 30,947 BCE, Ireland lay within the climatically unstable Late Pleistocene, although no evidence can identify conditions in that exact year. Derryvree, County Fermanagh, preserves freshwater organic sediments between glacial tills, indicating an interval of exposed, periglacial tundra with sedges, grasses, dwarf shrubs, mosses and wetlands before renewed ice advance. Castlepook Cave, County Cork, yielded diverse cold-adapted mammal remains, including mammoth, reindeer and predators, but its disturbed deposits prevent a single-date reconstruction. Ice-sheet growth was underway regionally. A possibly cut-marked reindeer bone suggests, but does not prove, early human visits. Political, social and cultural histories remain unknowable from direct evidence.

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31660 BCE

Derryvree’s Permafrost Garden

Archived: 15 September 2026

Abstract

Around 31,660 BCE, Ireland lay in the later Marine Isotope Stage 3, as conditions worsened before the Last Glacial Maximum. Derryvree, County Fermanagh, preserves silts recording an ice-free, periglacial wetland of tundra, sedges, mosses, insects and shallow pools. Castlepook Cave, County Cork, demonstrates the presence of cold-stage fauna, including mammoth, reindeer, giant deer, predators and smaller mammals, though not necessarily simultaneously. A marked reindeer femur may indicate brief human butchery, but cannot prove settlement. No polities or cultural communities are evidenced. Expanding ice, changing sea levels and uncertain routes made Ireland severe, intermittently accessible and ecologically still linked to Europe.

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