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

最后的英国-爱尔兰冰盖 (BIIS) 创造了一个包含许多沉积盆地的景观，这些盆地保存了末次冰期-间冰期过渡 (LGIT) 期间古环境和古气候变化的档案；~ 18-8 ka BP）。这些档案的典型岩石地层序列由寒冷气候条件下形成的矿物/异源沉积物和温暖气候下的富含有机物/自生沉积物组成。本文介绍了一个多核岩石地层学，这些岩石地层学是从位于南威尔士 Llangorse 湖的现存湖泊和周围盆地中编制的，该盆地位于最后一个 BIIS 的最南端。该湖包含英国最长的连续陆地沉积序列之一。先前存在关于与温德米尔 Interstadial (~  14.7 to ~  12.9 ka BP) 和 Loch Lomond Stadial (~ 12.9 至 11.7 ka BP）。一项新的钻孔调查表明，该地点存在 LGIT 时代的沉积物，其中有对应于晚冰期间期的 Nekron 泥 (gyttja)，沉积在湖水的较深部分，并且这些沉积物的年龄与发现的泥灰沉积物的年龄相同盆地边缘较浅的深度。这些沉积物与温德米尔 Interstadial 和全新世期间经历的温暖条件有关，而富含矿源的沉积物是在 Dimlington Stadial 和 Loch Lomond Stadial 的较冷气候条件下沉积的，测距仪放射性碳日期证实了这一归因。湖泊水位变化模型显示，Dimlington Stadial 冰川湖的排水造成了最大的下降，但也有进一步的下降，在全新世早期水位上升之前，较小的湖水位在温德米尔 Interstadial 结束时和/或 Loch Lomond Stadial 开始时下降。这里提供的岩石地层学结果构成了兰戈斯湖进一步古环境和古气候研究的框架。