Abstract
A variation of boulder concentrations are identified within the diamicton component of drumlins in western Ireland. These range from “single-casst” boulder lags to “diffuse” boulder concentrations with an internal spread of up to 4 m. The former may be attributed to selective lodgement processes thus being largely glacigenic in origin. The latter, which are frequently closely associated with sand layers, display close similarity to debris flow deposits, with the prominence of the clas concentrations being indicative of the fluid characteristics of the respective flows. The presence of the different boulder concentrations within a single drumlin or within drumlins of close proximity is indicative of disparate processes contributing to drumlin formation. Within the local embayment of western Ireland this may reflect a complexity of processes operating within a transitional zone between terrestrial and aquatic glacial environments.
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