The geological survey of the district lying between the South Downs and the Sussex coast has been completed, but the time needed for finishing and engraving the maps will make it impossible to publish a memoir for several years to come. It seems advisable, therefore, to bring before this Society an outline of the general results obtained, especially as certain of these results may seriously modify our views as to the succession of the deposits, and also as to the climatic changes in late Tertiary times in the South of England. A previous communication, published in this Journal, dealt with the question of the origin of the Coombe Rock and of dry Chalk valleys; I now propose to continue this work by showing the relation of the Coombe Rock to the various Pleistocene strata which occupy the plain lying between the southern edge of the Downs and the sea. I propose also to indicate briefly the probable correlation of these strata with the glacial deposits of other parts of England. The literature of the subject is somewhat extensive, for many good observers have examined the deposits between Brighton and Selsey Bill, especially the ‘Pagham erratics,’ the ‘mud-deposit’ of Selsey, and the Brighton ‘elephant-bed.’ It will scarcely be necessary here to speak of the whole of the writings relating to the district, but certain important memoirs and original observations must be referred to; otherwise it would be impossible to show in what respect the recently completed Survey supplements our previous knowledge