Interaction of multiple ice streams on the Malin Shelf during deglaciation of the last British–Irish Ice Sheet

The Malin Shelf, off north-west Ireland, was an important zone of confluence for marine-based ice streams the former British–Irish Ice Sheet (BIIS). Legacy geophysical datasets are used to construct models seismic character, relative age and distribution shelf sediments landforms. Buried surface landform assemblages provide evidence that during deglaciation Late Devensian BIIS, region occupied not by a single Hebrides Stream as previously proposed, but four discrete streams, here referred Sea (SHIS), Inner Hebrides, North Channel Tory Island streams. Our observations stratigraphic relationships between deposits these indicate physical interactions them deglaciation. We interpret initial dominant cross-shelf flow along SHIS impeding from other sheet sectors. Following withdrawal grounding line edge mid-shelf bathymetric highs deglaciation, reconfiguration paths allowed expansion smaller draining central Scotland north-western Ireland. This internal dynamic behaviour provides possible analogue time-transgressive patterns reported outlets West Antarctic Sheet.