78 



MAN AND THE GLACIAL PERIOD. 



Eiver, near where the kames and the river intersect, that I 

 began, in 1874, my special study of glacial deposits. The 



KAMES 



ANDOVER 



MAS S. 



| | ^8»_ 5. 



One fialf Mile. C&~|ls§§f! 



Andover ridges are composed of imperfectly stratified 

 water- worn material, and are very sharply defined, from 



