The Derryvree Cold Phase
31,808 BCE is a modern label rather than a recoverable Irish year, representing a broad Middle Midlandian interval within Marine Isotope Stage 3. Ireland’s conditions varied as the British–Irish Ice Sheet grew, producing severe, open periglacial landscapes rather than uniform ice cover. Derryvree and other Fermanagh deposits indicate wet treeless tundra, with sedges, grasses, shrubs, insects and freshwater habitats. Castlepook Cave preserves mammoth, reindeer, giant deer, predators and smaller cold-adapted animals, demonstrating intermittent ecological connections with Britain and Eurasia amid lower sea levels. A possibly cut-marked reindeer bone suggests, but does not prove, Upper Palaeolithic human presence without settlement evidence.
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On the Eve of Expansion
31,801 BCE is a modern reference year within the Late Pleistocene rather than a precisely...
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The Last Habitable Landscapes
31,802 BCE is an archive reference year within the Late Pleistocene. No Irish event can...
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Cold Rivers and Open Ground
31,803 BCE is a modern reference year in a period for which Ireland has no...
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Ireland at the Glacial Edge
31,804 BCE is an archive reference year within the Late Pleistocene rather than a securely...
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Animals on the Ice-Age Plain
31,805 BCE is a modern archive reference year within the Late Pleistocene. Ireland preserves no...
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Fermanagh Before Glaciation
31,806 BCE is used as an archive reference year within the Late Pleistocene. No single...
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Castlepook in the Cold
31,807 BCE is a modern archive reference point within the Late Pleistocene. No Irish event...
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Tundra Before the Ice
31,808 BCE is an archive reference year within the Late Pleistocene. Ireland preserves no event...
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Ice Approaches the Irish Landscape
31,809 BCE is a modern chronological marker, not a securely dated Irish event, with no written records, named people or settlements. Ireland then lay within a cold, unstable Late Pleistocene environment as the British-Irish Ice Sheet expanded unevenly. Open tundra, freshwater basins and treeless vegetation survived in places, although later ice destroyed much evidence. Inter-till deposits at Derryvree, County Fermanagh, indicate cold freshwater habitats. Castlepook Cave, County Cork, yielded reindeer, mammoth, giant deer, predators and other fauna, demonstrating substantial pre-glacial animal life. A marked reindeer bone may suggest brief human presence, but cannot prove permanent or continuous settlement in Ireland.
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