Abstract
Morphological and sedimentological investigations of the Rooskagh Esker, Co. Roscommon, indicate that there is a link between esker morphology and depositional environment. Sharp-crested ridges are underlain by glaciofluvial sediments laid down in subglacial tunnels and unroofed channels. Flat-topped segments are deltas, while fan-shaped areas are underlain by subaqueous outwash fans. Variation in morphology indicates that the esker is formed from repeated tunnel-to-ice-margin sections and is time-transgressive, indicating that the ice-marginal zone was characterised by stagnation zone retreat northward. The ice margin terminated in a proglacial lake.
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