﻿Geological Map, District about Montreal. 255 



This chapter is one which cannot fail to be extremely 

 interesting as well as instructive, especially to all 

 members of the Natural History Society who have enjoyed 

 any of the field days in the Laurentian country. 



The investigation of these older parts of the earth's 

 crust is of great scientific interest and economic import- 

 ance, especially in Canada, where the Laurentian system 

 has its greatest development, and from which it has even 

 derived its name. 



In writing of the importance of the study of Archean 

 (Laurentian) geology in Canada, Dr. J. E. Wolff, Professor 

 of Petrography in Harvard University, Mass., recently 

 said : " Dr. Adams, indeed, deserves the greatest credit 

 for his work on the Archean of Canada. One great 

 problem, that of the anorthosites, he has surely settled, 

 and his careful work in the field, combined with a 

 thorough knowledge of laboratory methods, is bearing 

 fruit in the attempt to solve some of the other problems 

 connected with the Archean generally and that of Canada 

 in especial. When one considers that this formation 

 covers much more than two million square miles in North 

 America, its importance as a field of investigation is 

 apparent, while the difficulty of the problem is evident 

 from the small progress made in fifty or so years in 

 solving some of its obscure features. 



I am convinced, by my own experience, that patient 

 detailed work will alone yield answers, and that much 

 which is unexpected can be obtained in this way ; we 

 must look to the stratigraphic relations for new discoveries, 

 and here there is still a o-reat field." 



