﻿360 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



is in part brought nearer to the Chalk-escarpment than in the envi- 

 rons of Harting and Trotton. 



Whether this anticlinal line be divisible into two parallels, as re- 

 presented in the map of Mr. Hopkins*, or constitute one oblique line 

 of fracture, as Mr. Martin believes, it is enough for my purpose to 

 show how some of the most remarkable collocations of highly angular 

 and sharply fractured flints have a close reference to it, whether we 

 examine the environs of Brighton or those of Lewes ; seeing that it 

 passes to the north of the former and the south of the latter place. 



The great disturbance of the Chalk near Lewes (long ago pointed 

 out by Dr. Mantell), as well as the persistence of this anticlinal 

 towards the east, is indicated clearly in the longitudinal valley which 

 lies between the Ouse and the village of Glynde. It is completely 

 denuded of all drift, the strata being there clearly arranged in an an- 

 ticlinal form, and thus constituting a valley of elevation. In consider- 

 ing the manner in which the drift has been accumulated in the Valley 

 of the Ouse, the important part played by this subsidiary valley of 

 elevation will be presently noticed. Let me only say, that if the flint- 

 drift before alluded to on the Weald clay at Barcombe be also refer- 

 able to this fracture in the chalk, there is just the same difficulty in 

 comprehending its translation thither without leaving some connect- 

 ing features between its original site in the adjacent escarpment and 

 the spot on which it now lies, as has been adverted to in the cases 

 of West Heath and Trotton Common. 



Detritus on the sides of the Transverse Valleys. — Each of the four 

 transverse valleys, by which the Arun, the Adur, the Ouse, and the 

 Cuckmere escape from the Weald through the Chalk to the sea, exhibits 

 ancient mounds of drift, more or less similar to what has been described, 

 arranged irregularly and at different altitudes upon their banks, from 

 20 to 100 feet above the present rivers. A glance at any of these 

 materials at once bespeaks the tumultuary nature of their origin ; for 

 none of them contain rounded or water- worn pebbles. At Peppering, 

 about 80 feet above the Arun, and midway in the gorge of the chalk, 

 bones of an Elephant were found, as cited by Dr. Mantell. 



In the defile of the Arun the promontories of North Stoke and 

 South Stoke are just in such relative positions as we may suppose 

 would have arrested or thrown off to the opposite sides masses of 

 detritus hurled along the valley ; and Peppering, being in a bay 

 opposite to the round promontory of Arundel Park, is therefore a 

 spot where we might look for a collocation of drift with bones. The 

 more open and straighter chalk-valley of the Adur with no marked 

 promontories or masses was little likely to arrest much drift, which 

 has chiefly been translated to the sea-board. 



If no fossil remains have been detected in the valley of the Cuck- 

 mere, it is probably because no cuttings have been made in that 

 sequestered tract. There I observed, however, mounds of loam and 

 sand with broken chalk-flints extending southwards from the zone of 

 Weald Clay at Arlington and the station of Berwick to the gorge 



* See Trans. Geol. Soc. Lond., N. S. vol. vii. PL I. 



