PALEOLITHIC IMPLEMENTS AT CRAYFORD. 



547 



has been repeatedly noticed in 

 the Geological Society's Jour- 

 nal, I shall not further de- 

 scribe it. 



This gravel contains palaeo- 

 lithic implements. Some years 

 ago I found a hache * in situ 

 in it, on Dartford Heath, which 

 is now in the British Museum ; 

 and this has been followed by 

 Mr. C. C. S. Fooks (of The 

 Bowman's Lodge, Dartford 

 Heath) obtaining, last year, 

 another from the same gravel, 

 not quite so deep, however, 

 and about 25 feet further 

 south. I have found a few 

 flakes, all bearing a general 

 resemblance to each other in 

 mineral character; and it is 

 from this gravel that I believe 

 some of the flakes that have 

 been found in the brick-earths 

 below have been derived. 



It appears that the river 

 afterwards left this level and 

 descended not less than 180 

 feet (perhaps more than 200), 

 cutting a deep channel, of which 

 the cliff in my first section 

 (fig. \) is a result. When at 

 its lowest, the river must have 

 been comparatively a small 

 one. The river then began to 

 rise slowly until the Avater 

 attained, if it did not exceed, 

 its old supremacy. 



It was during this rise that 

 the brick-earths were deposited, 

 some of which, containing ele- 

 phant remains, have been found 

 resting on chalk in the bed of 

 the Thames in Erith Eands, 

 about forty feet below the 

 datum line. 



Then the water retreated 

 again, washing away much of 





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* Pigurod in Mr. J. Evans's 'An- 

 cient Stone Implements,' p. 532. 



2l'2 



