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Ireland then occupied the north-western edge of Europe, but it was not the permanently isolated island familiar today. Sea levels were far lower than now, because vast quantities of water were locked in continental ice sheets. The geography of the Irish Sea basin, coastal plains and possible routes through Britain was consequently different, although the exact configuration and practical accessibility of routes changed through time. This does not prove routine movement of people or animals to Ireland; it establishes a very different physical setting for any such movement.
Modern BCE notation can give a false impression of exactness. Archaeologists normally express this era as thousands of years before present, with “present” fixed at AD 1950. Radiocarbon ages are not identical to calendar ages because atmospheric carbon-14 levels changed through time; they must be calibrated against long reference records. At around 32,000 calendar years ago, a determination can translate into a broad and sometimes irregular calibrated interval rather than a single point. Consequently, it is unsound to say what happened in Ireland on a particular day, season or year in 30,266 BCE. It is safer to discuss a horizon around 32.2 thousand calibrated years before present and to state how closely each specimen or sediment sequence approaches it.
Ireland had no recorded political communities in any meaningful historical sense. There is no evidence for rulers, territories, alliances, warfare, diplomacy, law or inherited institutions. Nor can later ethnic identities, languages or origin traditions be projected backwards into this landscape. The word “Ireland” is useful here only as a geographical shorthand for the landmass that would much later acquire that name.
Ireland at this point was approaching, but had not yet reached, the Last Glacial Maximum, when the British–Irish Ice Sheet became much more extensive. That distinction matters. “Ice Age” does not mean that every place was continuously sealed beneath ice. The island’s glacial history involved changing ice margins, exposed ground, meltwater, frost-shattered slopes and periods in which animals could move through parts of the landscape. Exactly where ice lay in 30,812 BCE cannot be mapped from the evidence available. Reconstructions of the last ice sheet are strongest for its growth after this broad period and for its later retreat; they caution against drawing a sharp, island-wide ice boundary for one notional year.
