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PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



lowest part properly called Pease Marsh, but ranges from Compton 

 and Godalming on the west, by Chilworth to Weston-street and 

 Alburyon the east, a distance of about six miles. Its width, depend- 

 ing on the form of the ground and the surrounding hills, contracts 

 from a breadth of about two miles from north to south, near Godal- 

 ming, as pointed out to me on the spot by Mr. Austen, to a very 

 narrow band in the longitudinal valley of the Tillingbourne brook 

 near Albury ; whilst in the transverse depression, extending south- 

 wards from Guildford into the Weald (the line of the Surrey and 

 Sussex Canal), it has a breadth of nearly four miles. 



In the lowest portions at Pease Marsh, where this drift is cut 

 through by the branch-railroads to Godalming and Reigate, it is 

 covered by much clay and loam ; but neither in the one mass nor in 

 the other could I discover better proofs of stratification than are 

 occasionally to be seen in the gravel-deposits of Hyde Park and Ken- 

 sington. The chalk-flints are of all sizes and colours, some angular 

 and others somewhat abraded ; and with them are associated nume- 

 rous flattened fragments of the " clinkers " of the Lower Greensand, 

 and rarely a piece of the grey-wether-sandstone of Tertiary age. None 

 of these materials have been fashioned into true shingle, and none of 

 them can, I think, have been accumulated in a bay of a former sea ; for, 

 although some marine accumulations may have such irregular appear- 

 ances, the materials could scarcely have been collected in a fiord or bay 

 without having some fragment of a marine shell among them. At a few 

 spots, just as around and under London, some sandy portions of the 

 mass are dovetailed in oblique laminae in lines of false-bedding among 

 the flints, which as a whole naturally lie in more or less horizontal 

 masses, and in conformity to the shape of the ground on which they 

 rest. The remains of extinct Elephants, Stags, and other lost species 

 of mammals, which have long been known to prevail here, were found 

 usually (at least, according to Mr. Austen, all the most perfect re- 

 mains) in the lower part of the stony detritus, or beneath it and 

 incumbent on the subjacent Weald-clay, to which, as before mentioned, 

 trees are still adherent. 



In its southern extension, or towards the Wealden, this drift con- 

 tinues to be covered with the same mass of unstratified clay along 

 Poundstone brook, and rises gradually to the village of Wonersh, to 

 which point chalk-flints accompany it. But when followed still fur- 

 ther southward, the drift changes its character, and instead of chalk- 

 flints we find in it (at a still higher level in the low hills south of the 

 Wonersh turnpike-gate) exclusively the hard debris of the Lower 

 Greensand ; the surface of that rock having been eroded, and its 

 cavities filled with the detritus of its own harder parts. 



In pursuing this drift eastwards from Pease Marsh by Chilworth to 

 Albury, it contains chalk-flints all the way, and is seen in like manner 

 to rise to some height above the present watercourse, constituting 

 sloping mounds of about half a mile in width, in some of which lo- 

 calities, and particularly near Weston-street, the mixed flint-detritus, 

 where coagulated, is scarcely to be distinguished from the " Combe 

 Rock " of Sussex. 



