Related Archive: 31808 BCE

Tundra Before the Ice

Archived: 13 September 2026

Abstract

The reference year 31,808 BCE introduces Ireland’s Late Pleistocene tundra environments while acknowledging that no event can be dated precisely to it. Environmental deposits, cave faunas and glacial evidence cover long periods. Cold grassland, sedges, herbs and low vegetation persisted where expanding ice had not overridden the ground. Fermanagh freshwater deposits demonstrate biological activity, while Castlepook Cave preserves remains of reindeer, mammoth, giant deer, bear, wolf and spotted hyaena. These assemblages connect Ireland to wider northwestern European ecology. The article interprets scattered evidence cautiously, separating an annual archive marker from the broader chronological ranges that scientific reconstruction can actually support.

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31808 BCE

The Derryvree Cold Phase

Archived: 13 September 2026

Abstract

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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