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Investigation of the environmental impact of remote volcanic activity on north Mayo, Ireland, during the mid-Holocene

Seven layers of microscopic tephra have been detected in ombrotrophic peat from western Ireland. A radiocarbon chronology suggests that two of the tephra layers were deposited around 4000 BP. Pollen, fungal spores and testate amoebae have been analyzed from the peat immediately above and below the tephra layers. These analyses provide information of changes in the landscape surrounding the bog and as well as conditions on the bog surface. Analysis of rates of change in these data has been employed to investigate the relative magnitude of environmental changes at the time of tephra deposition. Tephra deposition occurred at least 100 years after a major decline in Pinus pollen and coincides with fairly stable conditions in the terrestrial environ ment. More significant changes on the bog surface, indicative of wetter conditions, are associated with the timing of tephra deposition.