WALTON COMiLOJSr EXPOSING LONJ)ON CLAY ETC. 



149 



promontory, which separates the valley of the Mole from the valley of 

 the Wey. Towards the former the slope is gradual, towards the latter 

 somewhat abrupt. It should also be borne in mind that towards 

 the south-west this plateau reaches the northern slope of St. Greorge's 

 Hill, whose northern brow attains a height of 245 feet, where another 

 and much narrower area is continued towards the south for about 



Fig. 2. — Shetch-map sliowing the position of the section. 



'-"100 f 



% 



^ Mixed Gravel 

 Plateau Cravel 



.t?'S „. fresk section "*■ over London Clay 



Plaicau Gravel 



1000 ft 



■BaffsTiol Ben « 



one mile. Hence there are two principal plateaux in this district, 

 of which one is about 140 feet higher than the other. It is on these 

 flats, and not by any means on the slopes, that the Plateau-gravel is 

 found*. 



The following may be regarded as the principal formations or 

 subformations of the district which we shall have to consider. (See 

 fig. 1.) 



(y. Top sand. 

 x\ Mixed gravel. 

 X. Plateau-gravel. 



b. Lower Bagshot Beds. 



c. London Clay. 



Of these the " to'p sand " (v/) and the " mixed gravel " (x) are more 

 or less local deposits, not to be found perhaps under precisely similar 

 conditions elsewhere. The Plateau-gravel, also described as "hill- 

 gravel of doubtful age," is well known to dwellers in the Bagshot 

 districts, though it generally occupies higher ground. In fact the 

 "Walton-Oatlands plateau is perhaps the lowest elevation where this 

 particular kind of gravel is known to occur. It is briefly described 

 by Mr. Whitakert, who says, " It is not unlike much of our later 



* The following distances of certain points from Sir Eichard's Bridge, taking 

 this as a convenient centre, are given : — 



Nearest point of River Mole, E. by S 1 m. 735 yds. 



Nearest point of River Thames at Walton water- 

 works, N.N. W 1 m. 



Oatlands-Park hotel, W.N. W 1465 yds. 



Weybridge station, W.S.W 1 m. 930 yds. 



St. George's Hill, north end of plateau, S.W. ... 1 m. 840 yds. 

 t ' Guide to the Geology of London,' p. 63. 



m2 



