32 



ME. H. W. MONCXrON OK THE GRA.YELS SOUTH OP 



places overlain by 2 to 5 feet of reddish earthy clay, and the gravel 

 is itself frequently very clayey. The surface of the plateau is fairly 

 flat, but the sections show that the gravel rests in great hollows 

 in the Bagshot Beds and is 12 feet or more thick in places. On the 

 south there have been extensive slips of both gravel and Bagshot 

 Sand. A large proportion of the gravel consists of very big flints 

 much rolled and waterworn, nearly all brown, though a black one 



Fig. 2. — Section in a gravel-j)it at Upjper Hale, near Ccesar^s Camp, 



Aldershot. 



a. White sand and stones. No sign of stratification. 

 h. A reddish earthy mass. 



c. A mass of small-sized material. 



d. Irregular layer of red sand. 



e. Layers of brown sand. 



/. Mass of stones ; many large rolled flints. 



occurs here and there. Many of these flints are 6 inches and 

 some a foot in longest diameter. There is also a great quantity of 

 subangular flints and bits of flint often much worn and decayed. 

 Prof. Brest wich gives 36 per cent, of Tertiary flint-pebbles for this 

 gravel.^ Dr. Irving, however, cannot recollect ever meeting with 

 " rolled flint pebbles" in it,^ The present writer found plenty of 

 flint-pebbles in all the pits, many of them black and evidently 

 derived from Eocene pebble-beds, so that there is little doubt that 

 Prof. Prestwich's record is correct. Some blocks of sarsen-stone 

 occur. I examined a sample of the smaller material from one of 

 the pits, and found it to consist of — 



a. Subangular flints , 25 ^ of total weight. 



6. Flint-pebbles, many of them black 29 „ ,, 



c. Quartz 39 „ „ 



d. Chert in very small fragments *5 „ ,, 



e. Ironstone from the Lower Greensand and "I ^ 



irony concretions from the Bagshot Beds .J " " 



1 Quart. Journ. Geol. Soc. vol. xlvi. (1890) p. 161. 



2 Ibid. p. 559, note. 



