T his raised beach, with its curious old sea-cliff brought to light again in the modern cliffs at Kemp Town, was first made known by the late Dr. Mantell*. Mr. Dixon† afterwards showed that beds of the same age extended to Shoreham and Broadwater, near Worthing ; whilst Mr. Godwin-Austen‡ has more recently described, on the coast between Bognor and Bracklesham, two thin marine beds of Newer Tertiary age, the uppermost of which he considers synchronous with the raised beach of Brighton §. The exact range westward and inland of this old beach, or of the sea-deposits of the same age, has not, however, yet been determined. With a view to assist this inquiry, I beg to lay before the Society the facts having reference to it which I have collected during the last few years, whilst examining the Older Tertiary strata and the drift-beds of this district,—the result, however, more particularly of two excursions made with the special view of tracing, if possible, the line of old cliff along the southern base of the South Downs between Brighton and Portsmouth. On the present occasion I do not propose to touch upon the question of the drift ‖, beyond describing such portions of it as are exhibited in conjunction with the older sea-bed. I may merely observe that the drift which has passed over this district has so swamped and hidden even its later geological features, that in a distance of thirty-seven miles I could not find a single place where