Though the glacial deposits of some portions of the Trent basin have received a considerable degree of attention, no really systematic attempt has yet been made to ascertain their succession, or even to trace the horizontal extension of the more important members of the series. Mr. D. Mackintosh has certainly stated his opinion concerning the westerly extension of the Great Chalky Boulder-clay, and Mr. Searles V. Wood, Junior, has also dealt more or less theoretically with the whole subject; but before anything like certainty on these points can be arrived at, the succession over the whole area must be ascertained, and the horizontal extension of each member of the series traced. Sections have also been described by the Rev. Dr. Crosskey, Mr. W. J. Harrison, Mr. James Shipman, Mr. Molyneux, the officers of the Geological Survey, &c. &c. Many of these exposures, however, are now obscured by talus or overgrown with vegetation, while others I have not been able to visit. Indeed the following paper must be regarded as an endeavour to ascertain the succession obtaining in the Pleistocene deposits of the Trent basin, as shown by sections which I have myself examined, rather than as a detailed account of their distribution. For assistance in much of the field-work, especially that portion relating to Nottinghamshire, I am indebted to Mr. J. Shipman. My thanks are also due to Mr. A. J. Jukes-Browne, for his advice, and to Mr. J. J. Harris Teall, for the use of his notes. The observations