54 DIVERSIONS OF A NATURALIST 



it ground and tore the surface rock and carried large 

 and small masses boulders and incredible millions of 

 tons of broken up fragments and spread them over 

 East Anglia (where they form the so-called "glacial 

 drift "), and over regions still submerged in the North 

 Sea. Consequently the beach on the Suffolk seashore 

 has a specially variegated assortment of pebbles from 

 all sorts of more northerly situated rocks though 

 small flint pebbles, derived directly from glacial drift and 

 by the drift from the chalk land-surface (the chalk itself 

 not now reaching the shore-line of East Anglia), are 

 greatly predominant. It is in the chalk that flint takes 

 its origin, being found there as large irregular nodules 

 and sheets. 



