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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.
30850–30841 BCE
Rosy Saxifrage at Derryvree
Organic material from the Derryvree bed produced a conventional radiocarbon age of about 30,500 radiocarbon years before present, with an uncertainty of around a millennium. Radiocarbon years are not calendar years. Atmospheric carbon-14 has varied through time, so scientists calibrate measurements against independently dated records; at this antiquity, one result commonly converts into a broad, multi-millennial probability range rather than a narrow historical date. Successive improvements to calibration curves can also alter the range.
Castlepook Beyond Derryvree
The label 30,848 BCE should be treated as a point within a broad chronological neighbourhood, not as a fixed historical moment. A central Irish archive, the Derryvree freshwater sequence near Maguiresbridge in County Fermanagh, produced a conventional radiocarbon determination of about 30,500 ± 1,100 radiocarbon years before present. Calibration places that measurement broadly in the later part of MIS 3, but not neatly in a single calendar year; published recalculations and modern calibration curves necessarily yield wide ranges. The Derryvree sediments are therefore directly relevant to the environmental world of this article, while not proving that their plants, insects or waters existed precisely in 30,848 BCE.
Derryvree’s Mossland
The most important Irish evidence relevant to this horizon comes from Derryvree, near Maguiresbridge in County Fermanagh. Road construction in 1969 cut through a drumlin and exposed a remarkable sequence: glacial till below, freshwater silts, fine sands and organic material in the middle, and another till above. Till is unsorted debris deposited by glacier ice. The sequence therefore establishes a relative history with unusual clarity: ice affected the locality; an interval followed in which water, plants and small animals left sediments; then a later ice advance or ice-related deposition buried the record.
Awbeg’s Cave Fauna
Ireland around this broad horizon was neither the familiar green, wooded island of later prehistory nor necessarily a single, uniformly frozen wilderness. The later maximum of the British–Irish Ice Sheet is generally placed after this period, reaching its fullest extent around 27,000 years ago and persisting into the following millennia. Before that maximum, ice margins, sea levels and climates changed repeatedly. Some areas were glaciated at particular times; others supported open ground, freshwater and animal life. Subsequent ice advances eroded or buried much of the evidence, which is a major reason why the Irish record is so fragmentary.
