Crag Cave’s Thawing Calcite
Archived: 14 September 2026
Around 31,756 BCE, Ireland formed an unstable Ice Age frontier during Marine Isotope Stage 3, rather than a precisely datable historical setting. Derryvree sediments in Fermanagh record wet, largely treeless tundra between glacial advances. Castlepook Cave in Cork contains mixed remains of mammoth, reindeer, giant deer and predators, demonstrating a cold-climate fauna over millennia. A marked reindeer bone may indicate brief human butchery, but proves neither settlement nor sustained occupation. Crag Cave calcite shows intermittent thaws, linked to North Atlantic climate shifts. As conditions deteriorated, advancing ice later reshaped landscapes and destroyed, buried or disturbed much earlier evidence of prehistory.