The Ballinderry deglacial complex consists of large cross-valley morainic ridges, flat-topped glaciolacustrine deltas and outwash terraces. Associations between subglacial feeder channels and proglacial sedimentation are clearly demonstrated. Periods of ice-margin retreat-rate reduction, high sediment fluxes and the presence of proglacial ponded waterbodies resulted in the formation of extensive, flat-topped deltaic sediment bodies. Relatively minor advances of ice-margins during general retreat are recorded in tectonically-deformed cross-valley ridges. Overall, the morphology and sedimentology records an eastward and southward phased backwastage of ice from the Lough Fea platform towards the Lough Neagh lowlands. At one site (Lough Doo), the combination of an esker system, ponded waterbody and flat-topped delta form an aesthetically excellent topographic association. This association provides a clear picture of the relationships between subglacial channels (eskers) and the feeding of an ice-marginal delta.
