Welcome to Emerald Archives
Emerald Archives presents Ireland’s story one reference year at a time, from the deep prehistoric past to the modern era. Each article explores the evidence, people, places and developments associated with a particular year and places them within their wider historical setting. The collection brings together archaeology, politics, society, religion, culture, conflict, everyday life and changing landscapes in one continuously expanding timeline. New articles appear here as the archive grows. You can also explore the full Irish History Timeline, search the archive directly, or use Explore to move through the collection by period and subject.
31570–31561 BCE
The Derryvree–Castlepook Interval
31,566 BCE is best understood as a broad late Pleistocene interval rather than a dated Irish event. Freshwater sediments at Derryvree, Fermanagh, show episodically ice-free, cold, treeless wetlands between glacial advances, while Castlepook Cave, Cork, preserves fauna including reindeer, mammoth, giant deer, bear, wolf, Arctic fox and hyaena. These records indicate a changing Atlantic landscape, with intermittent milder conditions and uncertain animal routes. A possibly cut-marked reindeer bone hints at Upper Palaeolithic human activity, but proves neither settlement nor society. Subsequently, the British–Irish Ice Sheet expanded, covering much of Ireland and obscuring this fragile Ice Age world over later millennia.
BIRM-166 at Maguiresbridge
Around 31,567 BCE, Ireland cannot be described through yearly events, but through fragmentary environmental evidence. Derryvree, near Maguiresbridge, Fermanagh, preserves freshwater sediments dating broadly to this period, indicating ice-free, open, wet tundra with severe periglacial conditions. Ireland’s ice cover and coastlines were changing regionally as the British–Irish Ice Sheet developed and low sea levels altered connections with Britain. Castlepook Cave in Cork documents varied Pleistocene fauna, though its remains span long intervals and cannot form a single scene. No secure contemporary human settlement exists. A possibly butchered reindeer bone offers only provisional evidence of brief human activity during this era.
Moss-Rich Mud at Derryvree
About 31,568 BCE, Ireland lay within the unstable Late Pleistocene, although evidence permits only broad chronological ranges. At Derryvree, Fermanagh, moss-rich freshwater deposits beneath later till record treeless, cold periglacial terrain, with sedges, shallow water and open vegetation. Southern caves, notably Castlepook, preserve Marine Isotope Stage 3 fauna including mammoth, giant deer, reindeer, hyaena and Arctic species, indicating intermittent connections beyond Ireland. Changing sea levels and ice margins shaped access routes. A cut-marked reindeer bone may indicate brief human activity, but no secure settlement evidence exists. Subsequent ice expansion likely destroyed earlier archaeology, leaving an environmental rather than social history.
Derryvree’s Freshwater Witnesses
At 31,569 BCE, Ireland’s evidence belongs to a broad, climatically unstable Late Pleistocene interval, not a single year. Derryvree, County Fermanagh, preserves freshwater sediments between glacial tills, indicating an ice-free tundra-like wetland during later MIS 3. Castlepook Cave, County Cork, contains mammoth, reindeer, giant deer, bear and hyena remains, showing a diverse open-country fauna. A cut-like mark on a reindeer bone may indicate early human activity, but cannot demonstrate settlement. Approaching glacial maximum conditions, lower sea levels and uncertain routes shaped a changing landscape. Surviving sediments, bones and landforms reveal ecology and climate, but no political, cultural or social history.
Castlepook’s Hyena-Worked Fauna
Although 31,570 BCE cannot be treated as a recoverable Irish year, evidence from Marine Isotope Stage 3 reveals intermittent ice-free environments. At Derryvree, County Fermanagh, freshwater silts between glacial tills preserve plants and insects indicating cold, open, waterlogged terrain. Castlepook Cave, County Cork, yielded mammoth, reindeer, giant deer, bear, hyaena and other fauna, accumulated over time largely through natural and carnivore processes. A possible cut-marked reindeer bone may suggest human butchery, but proves neither settlement nor culture. Changing sea levels and ice affected animal dispersal. Renewed glaciation later erased much evidence, leaving a dynamic, fragmentary prehistoric landscape across the island.
