 The Wolstonian Stage was followed by interglacial climate of the Ipswichian Stage, during which hippopotamus are known to have lived as far north as Leeds.The most recent glaciations occurred during the Devensian Stage, which is thought to have started around 75,000 years ago, peaked around 20,000 years ago and ended a mere 11,500 years ago.The valleys of the Lake District and parts of the Pennines were further eroded by glaciers, with the ice sheet itself reaching south to Birmingham.