'...where they pass their unenterprising existence...': change over time in the Mesolithic of Ireland as shown in radiocarbon-dated activity

This paper presents the first detailed audit and analysis of radiocarbon-dated Mesolithic activity in Ireland. This provides a data set of 119 definite or possible sites and nearly 450 dates. This data set is reviewed to understand how changes in the character of archaeological activity and other biasing factors influence the distribution of radiocarbon dates across space and time. We present very different outcomes than previously published reviews, especially regarding the claimed impact of the 8200 cal BP climatic downturn. This is an outcome of the more reliable data set presented here. Some of the patterns identified are a product of sampling strategies, such as a peak in Earlier Mesolithic activity attributable to multiple dates from Mount Sandel. Others relate to restructuring of activity by hunter-gatherers leading to significant changes to the archaeological visibility of that activity at the change from Earlier to Later Mesolithic. Increasing numbers of radiocarbon dates at the end of the period, alongside the changing character of the archaeological evidence, may indicate low levels of population growth.