INTRODUCTION. 



491 



I Vi " 



le CORALLINE CRAG; 



showi ng the position 

 of the various sections and borings 



The dotted area iipriSiiits that 

 covered by the Coialhiie tra^. 



Pig. 2 (reproduced by permission of the Council of tlie Geological Society of London).— F. W. H. 



