

9 6 SCIENCE PROGRESS 



been washed cfff the bank before the period of deposition com- 

 menced. This is a point collectors would do well to consider, 

 for the brick-earth, with its bed of Corbicula fluminalis, testifies 

 to tranquil waters and a moderate climate ; and if it be true 

 that it does not contain, but only covers, the Mousterian in- 

 dustry, we cannot attribute the disappearance of the latter 

 to the severity of the climate. 



It is possible that the Crayford brick-earth is represented in 

 some other English valleys ; though this question wants working 

 out ; but nothing of the kind, nor any evidence of a corre- 

 sponding period of deposition, has been recognised in France. 



Aurignacean, etc. — It is generally admitted that a great 

 number of implements found on the surface, and therefore 

 hitherto classed as Neolithic, resemble Cave types ; but a 

 doubt still exists, and indeed has been strengthened in some 

 quarters by the discoveries at Grimes' Graves, as to how far 

 the age of implements can be determined by form alone, with- 

 out collateral evidence ; and it is therefore highly desirable 

 that every possible case of the occurrence of such implements 

 in geological deposits should be examined and recorded with 

 care. 



In France, M. Commont succeeded in locating most, if not 

 all, of the leading types of the Upper Palaeolithic series in the 

 highest Pleistocene deposit ; but although he proved his 

 specimens to be older than the Neolithic, it would be difficult 

 from his evidence alone to establish their relation to one 

 another. 



In England, too, a fair number of specimens have been 

 obtained from under sandy or alluvial deposits ; but by far 

 the most important work in this direction is that of Mr. Reid 

 Moir near Ipswich. 1 He found there in definite sandy beds a 

 lower industry of Upper Mousterian age, and an upper one of 

 Aurignacean ; above the latter, in a layer of "sludge," closely 

 resembling true Boulder Clay, and like it referred to a cold 

 period, were two early Solutrean implements ; while in the 

 uppermost layer of all was a Neolithic arrowhead. Thus in 

 one spot were found no fewer than three of the main divisions 

 of the Upper Palaeolithic series, in exactly the order already 

 determined in the French caves. Of the other interesting dis- 

 coveries of this careful observer — human bones and pottery 

 1 Jour. R. Anthrop. Inst. vol. xlvii. (1917), p. 367. 



