The ‘One Hundred Foot’ Raised Beach between Arundel and Chichester, Sussex

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Abstract
P restwich , as long ago as 1859, described the raised beach between Arundel and Chichester under the title of ‘The Westward extension of the old Raised Beach of Brighton’. Clement Reid, referring to the same deposits, writes, ‘The work of the survey having thoroughly corroborated Prof. Prestwich?s view that these deposits all belong to one period , [the italics are my own] there will be no occasion here to discuss the question’ ( Reid, 1892, p. 346 ). As a result of the general acceptance of this view of the continuity between the Brighton and Chichester deposits, it has been inferred that the underlying solid formations were not elevated horizontally, but with a considerable eastward lag; for the beach at the Brighton end is only some 15 feet above sea-level, while that at the Chichester end is 115 feet higher, though the distance between the two places is less than 30 miles. I do not know, however, of any indication of such differential movement, and it is far more likely that there are two distinct raised beaches here in Sussex, the one at about 15 feet, and the other at about 100 feet above existing sea-level. Clement Reid appears to give some support to this view, for he states ( 1892, pp. 355-6 ; and 1903, p. 40 ) that his Bed 5 at Selsey contains deposits probably of the same age as the Brighton 15-foot stage, and he also thought the beach deposits in the Waterbeach pit to be of

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