EARLY MAN IN BRITAIN. 



[CHAP. vi. 



as is shown by Prestwich, Lyell, 

 Evans, and others. 1 In illus- 

 tration of this, the observations 

 made near Bedford by Mr. 

 Wyatt may be quoted (Fig. 

 38). There flint implements 

 occur in a series of fluviatile 

 gravels in the valley of the 

 Ouse, largely composed of 

 materials derived from the de- 

 struction of the boulder-clay. 

 This is the upper chalky boul- 

 der clay of Mr. Searles Wood, 

 and out of this, as may be seen 

 in the figure, the valley has 

 been partly hollowed. Conse- 

 quently -the deposits within the 

 valley, including the fluviatile 

 gravels, are later than the 

 boulder clay of the district. 

 The same conclusion is indi- 

 cated by the section at Hoxne, 

 where fluviatile deposits with 

 Palaeolithic implements (Fig. 

 39) rest in a hollow of the 

 clay, as pointed out by Prest- 

 wich and Lyell. In the Thames 

 valley, also, and in the area to 



1 Wyatt, Geologist, 1861, p. 242. 

 Quart. Journ. Geol. Soc. Lond. xviii. 113, 

 xx. 183. Prestwich, op. cit. xvii. 362. 

 Lyell, Antiquity of Man, 4th edit. p. 214 

 et seq. 



