468 



SCIENCE PROGRESS 



£LJ\Clr\l_ 





SUB CRA^ 

 £jp£TrU?v)S B63V 



Fig. 2. — Vertical section showing the principal beds forming the plateau near Ipswick. 



Pre-palacolithic flint implements have been found in the sub-Crag detritus-bed, the Middle 

 Glacial Gravel, and the Glacial Boulder Clay. 



Though these specimens occur sealed down beneath a 

 definite Pliocene deposit, it is evident that they cannot repre- 

 sent man's first efforts in flint-flaking, and the earliest examples 



