Derryvree Between Glaciations
Archived: 6 October 2026
Abstract
At the notional date of 30,189 BCE, Ireland’s history can only be reconstructed from uncertain environmental evidence. Derryvree, County Fermanagh, preserves organic freshwater sediments between glacial tills, dated broadly to later Marine Isotope Stage 3, showing a temporary ice-free, tundra-like landscape before renewed glaciation. Castlepook Cave in County Cork contains diverse Late Pleistocene fauna, including reindeer, mammoth and hyaena, although its mixed deposits cannot depict one moment. A possibly tool-marked reindeer bone suggests a brief human visit around 33,000 years ago, but secure evidence of occupation is absent. Ireland remained a harsh ecological frontier, repeatedly altered by ice and sea.