Reply: Denudation rates in southeast Northumberland since the Devensian glaciation

Undoubtedly the coastal till plateau of Northumberland was deeply incised b y rivers crossing from the ice-covered uplands inland, and no doubt locally modified by subglacial drainage before the ice wasted back. Two approaches were used to allow for this in the measurement of the contribution of post glacial subaerial erosion to the shape of the contemporary landscape, and t hus in the calculation of mean rates of erosion. If, despite these adjustme nts, the average depth of erosion has been overestimated. the error can be little more than 15 per cent. (C) 1998 John Wiley & Sons, Ltd.