“…The Wykeham Moraine is generally taken to mark the maximum western advance of the North Sea arm of this ice-sheet, at the eastern end of the Vale of Pickering (Penny and Rawson, 1969;Evans et al, 2016), although others have suggested a more westerly maximum ice limit to the east of Pickering (Foster, 1985). However, the deposits of the Wykeham Moraine are not tills (diamicton), but consist of glaciofluvial sand and gravel, probably deposited at the frontal lobe of the ice-sheet (Penny and Rawson, 1969;Edwards, 1978). Bateman et al, 2011 revised the chronology of the Dimlington Late Glacial Maximum type site (Rose, 1985), showing that the Yale of York and North Sea ice lobes advanced between 21 -19 ka, thereby blocking the western and eastern ends of Glacial Lake…”