I. I ntroduction . The region dealt with in this paper is roughly triangular in shape, extending from its northern apex at Blackstone Edge, east of Littleborough, to beyond Crich in the south-east, and along the southern line of the Pennines to Madeley and Market Drayton in the south-west. It comprises the Carboniferous Limestone plateau of the Derbyshire Dome, the ‘Edges’ of the grits, and the intervening valleys of the shales of the Millstone Grit of the south-western slopes of the Pennines, together with the marginal plains of Triassic rocks which border these in East Lancashire, Cheshire, Staffordshire, and Derbyshire. Some idea of the nature of the relief of the country may be gleaned from the accompanying map (Pl. XIX), and of the solid geology from the quarter-inch maps of the Geological Survey of England & Wales (Sheets 7 & 11). This area forms the southerly continuation of that described by one of us in an earlier communication to this Society. A brief outline of some of the main conclusions set out below was presented at the Manchester Meeting of the British Association in 1915. Numerous notes on the Glacial geology of this area, dealing chiefly with the distribution and character of the drifts and the erratics, are to be found scattered throughout English Glacial literature. Reference will be made to the most important of these, in the course of this paper, as occasion arises. The Glacial deposits, with their smooth and striated boulders which thickly cover the plains, the far-travelled erratics