Awbeg Limestone Fauna – Emerald Archives

Dateline

“31,865 BCE” is a useful modern filing label, not a date at which Ireland can be observed year by year. No written record, seasonal sequence or archaeological layer can be assigned to that single calendar year. At this depth of time, chronology comes from radiocarbon determinations, cave sediments, pollen, animal bones and ice-sheet reconstructions, each carrying margins of error. The responsible setting is therefore a broad one: Ireland during Marine Isotope Stage 3 (MIS 3), the comparatively variable middle part of the last glacial cycle, conventionally dated c. 57,000–29,000 years ago. The notional year falls around 33,800 calendar years before present, but calibrated ranges, rather than an exact annual event, are the proper scale of discussion.

A Landscape Before the Ice Maximum

Ireland was not yet at the Last Glacial Maximum, when the British–Irish Ice Sheet expanded dramatically and covered much of the island. That later maximum is generally placed around 27,000–23,000 years ago in the Irish Sea and Celtic Sea sectors, with substantial regional variation in the timing and behaviour of ice. Around the present horizon, conditions were cold, unstable and markedly different from those of modern Ireland, but it is unsafe to picture the whole island as either continuously ice-covered or uniformly open. Glaciers, permafrost, snow cover, exposed ground and vegetated refuges changed across both space and time.

Global sea level was considerably lower than today during MIS 3, exposing wider coastal plains and altering the outline of the Irish Sea and Celtic Sea. Yet lower seas did not automatically make travel easy. Any route between Ireland, Britain and continental Europe would have been shaped by shifting shorelines, rivers, wetlands, marine channels and, crucially, ice margins. The evidence does not permit a map of a particular crossing in 31,865 BCE. It does show that Ireland was part of a north-west European ecological zone whose animal populations could change as climates warmed or deteriorated.

The later ice advance matters for another reason: it destroyed and buried evidence. Moving ice eroded older surfaces, redistributed sediment and removed many traces that a brief human visit might have left. The scarcity of Palaeolithic evidence in Ireland is consequently not proof that nothing ever happened there; it is, however, a firm reason not to turn possibility into a settled narrative.

Castlepook and the Southern Fauna

The most important evidence close to this remote horizon comes from Castlepook Cave, also called Mammoth Cave or Doneraile Cave, near the Awbeg valley in north County Cork. Excavations undertaken in the early twentieth century recovered a remarkable quantity of animal remains from cave deposits. The surviving collection includes evidence for reindeer, woolly mammoth, giant deer, brown bear, wolf, Arctic fox, lemmings and spotted hyaena. It is one of Ireland’s richest Pleistocene faunal assemblages, and it establishes beyond reasonable doubt that animals now absent from the island inhabited or reached parts of Ireland during the last glacial period.

This is powerful evidence, but not a photograph of one moment. Castlepook’s bones were recovered in antiquarian excavations, long before current standards of recording, sieving, stratigraphic control and sampling. The cave contains deposits of differing ages, and some material may have been moved or contaminated after its original deposition. Older radiocarbon programmes provided apparent ages in the range relevant to MIS 3; subsequent redating, using improved pretreatment methods, demonstrated that several southern Irish cave specimens were appreciably older than their earlier measurements suggested. The revised results indicate that elements of the Castlepook fauna belong to an earlier MIS 3 world and that some species may have disappeared locally before the later ice maximum.

Thus the cave supports a cautious conclusion rather than a precise annual fauna list. Reindeer, mammoth and hyaena are credible components of Ireland’s broader cold-stage record. It cannot demonstrate that every listed species stood in the Awbeg valley in the same season, still less in the numbered year used here. The assemblage records repeated ecological opportunities, animal deaths and cave use across time.

Open Ground, Predators and Prey

The animals nevertheless give a vivid, if incomplete, sense of the landscape. Reindeer and lemmings point towards cold, open habitats; Arctic fox reinforces that impression. Woolly mammoth and giant deer evoke extensive grazing country, while wolves and spotted hyaenas indicate a working predator-and-scavenger guild. This was not the later wooded Ireland of popular imagination. The likely landscape included herb-rich tundra, grassland and sparse shrub vegetation, broken by streams, limestone ground, sheltered hollows and local patches of more productive cover.

Predators are especially important because a cave bone accumulation need not be a human food refuse deposit. Hyaenas may carry carcass parts into dens, gnaw bones and leave them in complex deposits. Other bones may have washed in, fallen through fissures or been disturbed during later cave activity. A mammoth bone in a cave does not mean a mammoth died there, and a reindeer femur does not by itself identify a hunting camp. Taphonomy—the study of what happened to remains between death, burial and excavation—is central to every interpretation of Castlepook.

Environmental change was rapid on the long timescale of a human life. Greenland ice-core records and North Atlantic archives show repeated abrupt swings between colder stadials and relatively milder interstadials during MIS 3. Ireland’s local deposits are too fragmentary to match every one of these episodes confidently, but they caution against describing a single unchanging “Ice Age climate”. A landscape hospitable to grazing animals in one interval might have become far less viable as temperatures fell, snow persistence increased or ice expanded.

The Human Question

A reindeer femur from the historic Castlepook collection has been publicly reported as bearing marks consistent with cutting or chopping by a stone tool and as dating to roughly 33,000 BCE. If the marks are confirmed as anthropogenic, and if the specimen’s age and context are securely established, it would be extraordinarily early evidence for human handling of an animal in Ireland. It would suggest a short Upper Palaeolithic incursion by Homo sapiens during favourable MIS 3 conditions, many millennia before the well-attested post-glacial settlement of the island.

That proposition must remain conditional. The bone was not recovered from a modern, tightly recorded occupation surface, and no associated hearth, stone-tool assemblage, dwelling, burial or repeated camp layer has yet supplied the supporting archaeological context expected for a secure settlement claim. Marks on bone must be distinguished from carnivore damage, trampling, sediment abrasion, excavation damage and breakage after burial. The specimen is important precisely because it raises a testable question; it cannot bear the weight of an invented population history.

Nor should later evidence be pulled backwards in time. A butchered brown-bear bone from Alice and Gwendoline Cave in County Clare gives strong evidence for human activity at c. 12,810–12,590 calibrated years before present, near the end of the Pleistocene. That find demonstrates that people did reach Ireland long before the Mesolithic, but it dates more than twenty millennia after the horizon considered here. It neither confirms nor disproves an earlier Castlepook visit.

No Polities, No Recorded Conflict

There is no evidence from Ireland at this date for political communities, named peoples, leaders, diplomacy, warfare, formal religion, trade institutions or permanent settlement. It would be anachronistic to speak of an Irish nation, tribe or kingdom. Even if a small hunting party briefly entered the island, its language, kinship, numbers, origins, route and duration of stay are unknown. A single processed animal, if that is what the Castlepook femur eventually proves to be, would show an episode of activity, not a resident society.

The wider European Upper Palaeolithic provides a comparative context only. Elsewhere, mobile hunter-gatherers made sophisticated stone tools, used animal resources intensively and sometimes created personal ornaments, images and structured places. None of that can responsibly be assigned to Ireland without Irish objects or deposits. There is no Irish evidence at this horizon for art, ceremony, teaching traditions, exchange goods or a built domestic economy. Absence of proof is not proof of cultural incapacity; it is a boundary on what historians may claim.

Economy at the Edge of Evidence

If humans did pass through southern Ireland in MIS 3, subsistence would most plausibly have involved mobile hunting, scavenging or butchery of large game, supplemented by whatever smaller animals and seasonal resources the landscape offered. This is an inference from the fauna and from contemporary hunter-gatherer lifeways elsewhere, not direct evidence of an Irish diet. There are no excavated plant foods, fishing gear, storage pits or tool kits from 31,865 BCE. Nor is there evidence for exchange across sea or land routes.

The soundest history of this time is therefore ecological and archaeological rather than political. Ireland was a changing glacial landscape, intermittently capable of sustaining striking cold-adapted mammals. Castlepook preserves a fragment of that vanished world in limestone sediments and museum collections. Whether people shared it at the requested horizon remains an important but unresolved question. Future excavation, microscopic analysis of bone modifications and further direct dating may narrow the uncertainty; they will still yield ranges and episodes, not a chronicle for one modern calendar year.

Primary Sources

Tags: Awbeg Limestone Fauna, County Cork, Early Holocene, Ireland Year by Year, Irish Ice Shee, Last Glacial Maximum