The Late Quaternary sediment successions of Llangorse Lake, south Wales

The last British-Irish Ice Sheet (BIIS) created a landscape with many sedimentary basins that preserve archives of paleoenvironmental and paleoclimatic change during the Last Glacial-Interglacial Transition (LGIT; ~ 18-8 ka BP). typical lithostratigraphic succession these is composed minerogenic/allogenic sediments formed cold climatic conditions organic-rich/authigenic warmer climates. This paper presents multi-core lithostratigraphy compiled from extant lake surrounding basin at Llangorse Lake, south Wales, lying within southernmost limits BIIS. contains one longest continuous terrestrial sediment successions in UK. Uncertainty previously existed concerning presence distribution site related to Windermere Interstadial (~ 14.7 12.9 BP) Loch Lomond Stadial 11.7 A new borehole survey demonstrates LGIT-age are present nekron mud (gyttja), corresponding Lateglacial Interstadial, deposited deeper part waters deposits equivalent age marl found shallower depths margins basin. These associated experienced Holocene, whilst minerogenic-rich were colder Dimlington rangefinder radiocarbon dates confirming this attribution. model level changes shows drainage glacial caused largest fall, but there was also further, smaller fall end and/or start Stadial, before rose early Holocene. results presented here form framework for further research Lake.