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We present results for a 3.5 m composited and spliced palaeolake sediment core taken from Thomastown Bog (53 39'25.8" N, 6 28'24.1" W), a small basin in Co. Meath, eastern Ireland. Multiproxy investigations comprising rangefinder C-14 dates, pollen, chironomids, stable isotopes (O and C), loss-on-ignition (LOI) and new µXRF analysis (using core scanning step-lengths of 0.2 mm) have produced an ultra-high resolution record of palaeoenvironmental change, spanning the Late Glacial to Holocene transition (ca. 15000 to ca. 9000 cal. BP). The sediment stratigraphy of the former lake is characterized by intercalated lacustrine marls and clastic silts, underlain by laminated, dark clays and capped by organic mud and peat that formed as the lake shallowed. Six local pollen assemblage zones have been recognized, spanning four distinct climatic episodes from the Late Glacial to early-Holocene. Major climate …