WALTON COMMON EXPOSING LONDON CLIY ETC. 169 



gravels, which are so frequently found at the base of the superficial 

 beds on Walton Common. It must be borne in mind that Haines' 

 Bridge is almost at the foot of the slope of St. George's Hill, on the 

 top of which there is a large outlier of Middle Bagshots, and it is the 

 wear of these, I imagine, which may have contributed to the forma- 

 tion of such a bed as n. There is nothing suggesting ice-action in 

 this lower group, which seems to have preceded by some time the 

 more confused and drift-like deposits overlying it, which were formed 

 since n has been cut through, if one may judge from appearances. 

 Hence at this point the Plateau-gravel is divisible into two series of 

 slightly different age. 



St. George^ s Hill. — It only remains to institute a comparison with 

 the Plateau-gravel of St. George's Hill. The pit on the summit- 

 level, or table-land, at present in work is situated about halfway 

 between the north and south ends of the hill. This may be taken 

 to represent an average sample of the most elevated sheet of gravel 

 in the Weybridge district, and is probably about 250 feet above O.D. 

 The longest face of the yorking is 45 yards, with a mean depth of a 

 little under 9 feet. There is no " Top Sand " here, such as we have 

 in Oatlands Park, only the upper part of the gravel becomes more 

 sandy, as though the sand had worked up, and the flints had worked 

 down rather — the wind, too, probably assisting this process, which 

 seems very general in sandy gravels. The gravel rests on a 

 slightly undulatino: surface. It is moderately sandy in places and 

 includes a piece of argillaceous Middle Bagshots about a foot long. 

 But the most striking feature in the section is a mass of brownish 

 sand, 11 yards long and about 2 or 3 feet thick, occurring in the 

 midst of the gravel in such a way as to suggest the idea that it had 

 been floated bodily into that position. 



I think, however, that the strongest evidence of ice- or snow- 

 action is to be found at the loam-pit on the north flank of St. 

 George's Hill. It has before been stated that the two great gravel 

 sheets of this district are (1) on the summit plateau, and (2; at the 

 northern foot of St. George's Hill, the latter being, of course, what 

 I have called the Walton- Oatlands sheet. It has also been stated 

 that the slopes of St. George's Hill are clear of Plateau-gravel. But 

 at the loam-pit there is a subordinate plateau or shelf just at the 

 foot of the sharp rise which constitutes the final summit. This lies 

 about 185 feet above 0. D., and it contains a very interesting 

 superficial deposit, which may fairly be ranked with the Plateau- 

 o-ravel, although there is very little actual gravel in it. 



Fig. 8 will serve to explain what I have called the " contorted 

 series," as it is seen overlying the basement-beds of the Middle 

 Bagshots at the place in question. The Middle Bagshots hero 

 consist of a buff laminated clay or clayey loam of a very tenacious 

 character. The superficial beds are made up of green and brown 

 sands and loams in a contorted arrangement mixed with tongues of 

 the underlying pale buff laminated clays, which have been squeezed 

 up in the manner represented ; jambs of flint-gravel occur here and 

 there, but not of large size ; and flints generally are rather scarce. 



