144 



Dr. FiTTON on the Strata below the Chalk. 



ment and the downs from Dorking- to Guildford is of nearly uniform character : 

 but in approaching the latter place, the Lower green-sand rises with such 

 rapidity, that Martha's Chapel equals or out-tops the chalk, though less 

 than a mile distant from it horizontally. Slighter indications, also, of dis- 

 turbance are evident throughout this tract. The lower marly chalk at 

 Deerleap above Wotton is divided by smooth surfaces, produced by the 

 sliding of large masses upon each other : and where the road rises from the 

 mill towards Abinger Church, at a point which corresponds with a con- 

 tinuation of the ridge above mentioned, near Brastead and Sundridge, the 

 beds are curved, so as clearly to indicate derangement. 



(5G.) The road west of Dorking, between Westgate Heath and the Rookery, 

 is cut through the first beds of the Lower green-sand, the top of which is 

 eroded into irregular cavities, resembling those which are found, through, 

 out the south-east of England, on the surface of the chalk ; and, like them, 

 filled with reddish loam and fragments of chalk flints. This being one of 

 many indications, on the margin of the great Wealden valley, that the agents, 

 whatever they were, by which the chalk was excavated, acted in the same 

 manner on the beds beneath it, and filled up the cavities with similar mate- 

 rials, at least as far down as the Lower green-sand. 



M///Jl%;///////^/..,J^^,/y/^tl//i^JiyM/4^ 





^'^f. 



■■■- " - — ""■ tvj^ ^^^ 



Surface. 



°^<>'%>° c>£i> Reddish Loam and Gravel. 





. . Lower Green-sand. 



The lower strata of the quarries near Cold Harbour, immediately under 

 the tower at Leith Hill, are almost identical with those of Tilburstow, 

 (p. 139); consisting of very green sand and soft sandrock, which alternate 

 with chert, and include green matter, with white, vermicular or stem-like 

 bodies, as at that place. 



(57.) Guildford, Godalming, Farnham, Hindhead. — The tract on the south 

 and west of Guildford, and thence to Hindhead, forms one of the most ex- 

 tensive surfaces of the Lower green-sand to be found in England ; and the 

 section from the heights on the north-west of Farnham to the Weald, (Plate 

 X a.. No. 4.) includes a succession of strata, from the Bagshot sands, one of 

 the highest members of the English series, down to the Weald clay. 



