The Awbeg Reindeer Incision – Emerald Archives

Dateline

The label 31,816 BCE is a modern chronological convenience, not a date that can be recovered as a single year from Ireland’s Ice Age record. It lies roughly 33,766 years before the conventional radiocarbon baseline of 1950, within the Late Pleistocene and Marine Isotope Stage 3 (MIS 3). At this depth of time, scientific dates carry uncertainty, and conversion from radiocarbon years to calendar years depends on calibration curves. No Irish person named a year, left a written record, or can be tied responsibly to this one. The appropriate question is therefore not what happened in Ireland in 31,816 BCE, but what securely dated deposits, animal remains and changing landforms reveal about the island in the broad interval surrounding it.

A Country Before the Ice Peak

This was not yet the Last Glacial Maximum, the later phase when the British–Irish Ice Sheet reached its greatest extent. Current reconstructions place the maximum expansion of ice around Ireland and its continental shelf broadly between about 27,000 and 23,000 calibrated years before present, although the timing differed between sectors. Around the notional date considered here, ice was growing on a continental scale, sea level was falling, and Ireland’s geography was changing rapidly. Low sea level exposed areas that are now seabed, while glaciers, meltwater and permafrost altered routes across the wider Irish–British region. That did not necessarily make travel simple: exposed ground could be cold, boggy, cut by rivers, or blocked by ice and unstable margins.

MIS 3 was not a single unbroken winter. Greenland ice cores show repeated abrupt switches between colder stadials and relatively milder interstadials. These were North Atlantic climate shifts, not a weather diary for Ireland, but they provide the wider framework for Irish evidence. Temperatures, vegetation and the extent of ice could change markedly over centuries or millennia. A scene reconstructed for one part of the island cannot be assumed to describe every coast, valley or upland, still less one precise calendar year. The main historical fact is environmental volatility: Ireland was on the north-western edge of the European landmass during a period of fluctuating cold.

Derryvree’s Periglacial Wetland

The clearest Irish environmental archive relevant to this broad period lies at Derryvree near Maguiresbridge, County Fermanagh. Road cutting through a drumlin exposed freshwater silts and fine sands trapped between two separate till sheets. The organic deposit yielded a conventional radiocarbon determination of 30,500 years BP, with a substantial published uncertainty of +1,170 and −1,030 years. That is a radiocarbon measurement rather than a calendar date; calibrated equivalents must be treated as a broad range spanning millennia, not a pinpoint. Crucially, the layers show that there had been an interval of open ground and freshwater sedimentation between phases of glaciation.

Pollen, plant macrofossils, mosses and insects from Derryvree indicate a treeless, periglacial environment. Grasses, sedges, herbs and juniper formed a sparse vegetation cover around wet ground and pools. Researchers have compared the setting to muskeg: waterlogged, moss-rich terrain with plentiful organic matter but harsh frost conditions. This was not an Irish woodland, a future pasture or an empty white ice sheet. It was a cold mosaic of shallow water, sedge beds, exposed mineral ground and low vegetation. Such places could sustain invertebrates, birds and grazing mammals in favourable seasons, while remaining difficult country for any human visitor.

Derryvree offers environmental evidence, not evidence for people. No camp, tool scatter, hearth, shelter or human remains of this age has been excavated there. Its importance is that it demonstrates the ecological possibilities available during part of the Middle Midlandian, the Irish name for this phase of the last glacial period. It also records the instability of the landscape: the freshwater deposits were later overridden or buried by ice-derived sediment. The drumlin visible in the modern Fermanagh countryside thus contains a compressed record of alternating water, tundra and glacial advance.

Animals in the Cork Caves

For southern Ireland, Castlepook Cave near Doneraile in County Cork is the essential site. Also known as Mammoth Cave, it was explored extensively in the early twentieth century and has yielded one of Ireland’s richest collections of pre-Last Glacial Maximum vertebrate remains. Woolly mammoth, reindeer, giant deer, brown bear, wolf, Arctic fox, Arctic lemming and spotted hyaena are represented in the wider cave assemblage. This is striking evidence that, at differing times during the late Ice Age, Ireland formed part of the ecological world of north-western Europe rather than an isolated refuge with only modern fauna.

Yet the word “differing” matters. Castlepook’s bones were accumulated over a very long period, in a cave excavated before modern standards of stratigraphic recording. Some may have been carried in by carnivores; others were disturbed by water, collapse, digging and later collection practices. Modern redating has shown that several earlier radiocarbon results needed major revision. The Geological Survey of Ireland gives a broad range of roughly 45,700 to 19,950 radiocarbon years BP for individually dated cave material. Consequently, mammoth, hyaena and reindeer remains cannot simply be arranged into a single herd scene for 31,816 BCE. They demonstrate changing animal communities, not simultaneous coexistence at one moment.

The fauna nevertheless makes the Irish landscape more intelligible. Reindeer are particularly well suited to open, cold country and would have found forage in herb-rich tundra. Mammoths and giant deer imply extensive feeding grounds somewhere within the wider region during their respective appearances. Spotted hyaenas and wolves were mobile carnivores and scavengers; caves could serve as dens, traps or repositories for bones rather than as places where animals died naturally. Their presence should not be romanticised as proof of an abundant, benign landscape. Large mammals could range across great distances, and a cave collection is biased towards what predators dragged in and what geology happened to preserve.

The Single Mark and the Human Question

One Castlepook object bears directly on the question of human activity. A reindeer femur in the old collection has a deep incision interpreted by zooarchaeologist Ruth Carden as a cut made with a sharp stone tool while the carcass was being processed. County Cork heritage material has presented the bone as dating to about 31,000 BC and as the earliest potential evidence for people in Ireland. Near the broad timescale denoted by 31,816 BCE, it is therefore the most important possible human trace.

Its implications need to be kept proportionate to the evidence. The radiocarbon date establishes the age of the animal bone, not the identity, number, language or residence of whoever may have marked it. The interpretation of the incision as a tool cut is a specialist judgement, distinct from the dating result. If accepted, it shows that at least one person used a sharp lithic edge on a reindeer carcass. It does not show whether hunters killed the animal, found it dead, removed meat, opened the limb for marrow, cut hide or sinew, or processed it elsewhere before the bone reached the cave. Nor does it demonstrate a permanent settlement, a repeated seasonal camp, or a population descended from later inhabitants.

There are no securely associated stone tools, hearths, dwelling floors, graves, ornaments, art or human bones from Ireland of this age. Renewed work at Castlepook has sought surviving undisturbed sediments that may eventually test the old collection more fully. Until such contexts are found and published, the most responsible conclusion is restrained: brief human incursions into Ireland in the Upper Palaeolithic are possible, and the marked femur may be evidence of one, but continuous or settled occupation is unproven.

Society Beyond the Evidence

Because even human presence remains uncertain, political history cannot be written for this date. There is no evidence for rulers, territories, assemblies, diplomacy, warfare between communities or any institution comparable to later Irish kingship. Likewise, there is no basis for identifying a religion, named tradition, language, school of learning or artistic system in Ireland around 31,816 BCE. It would be misleading to borrow cave art, burial customs or tool traditions from continental Europe and present them as Irish facts. They are useful comparisons for what mobile Upper Palaeolithic people elsewhere could do, not proof that those practices occurred here.

If the Castlepook mark was made by people, the most modest social and economic interpretation is a small, highly mobile party capable of using a stone cutting edge and exploiting a large animal. Reindeer could supply meat, fat, marrow, hide, sinew and bone, but the surviving mark cannot reveal which resource mattered most. Such a visit would have depended upon knowledge of terrain, animal movements, weather and safe routes across a landscape unlike modern Ireland. It tells us nothing secure about exchange or long-distance trade. No imported raw material or object can presently map a route between Ireland, Britain and continental Europe at this time.

Approaching a Transformed Island

The long-term direction of change was towards more extensive glaciation. In the millennia after this notional year, the ice sheet expanded across much of Ireland and the surrounding shelves, remodelling valleys and lowlands and erasing or burying many earlier surfaces. That destruction helps explain why the evidence is so sparse. The archaeological silence may partly represent real absence of people, but it also reflects the poor survival of open-air sites in a glaciated landscape. Caves, buried organic beds and scattered fossil collections survive precisely because they are exceptional archives.

Thus Ireland around 31,816 BCE is best understood as a changing cold-world frontier, not as a nation with a recoverable annual narrative. Derryvree preserves open tundra wetland between ice advances; Castlepook preserves a long, mixed record of animals adapted to very different Ice Age conditions; and a single reindeer femur raises, but does not settle, the possibility of human activity. The decisive developments were climatic, ecological and geological. Any people who reached the island left a footprint so slight that it remains visible chiefly as a question cut into bone.

Primary Sources

Tags: Awbeg Reindeer Incisio, County Cork, Ireland Year by Year, Irish Ice Shee, Political History, The Awbeg Reindeer Incisio