494 H. M. AMI THE GEOLOGY OF QUEBEC. 



We should thus have the Quebec group divisible into three natural and 

 well-marked parts : 



3. The Quebec or upper division ; 

 2. The Levis or middle division ; 

 1. The Sillery or lower division, 



just as we find the Trenton group divisible also into series of terranes ; and 

 these divisions are all marked by peculiar and distinct faunas, each of which 

 is characterized by fossils to be given in the table hereto appended. 



The Trenton group characterizes the upper portion of the Cambro-Silu- 

 rian or Ordovician system ; the Quebec group characterizes a portion and 

 peculiar development of the Cambro-Silurian or Ordovician. 



