ILLUSTRATIONS 
Page. 
Plate  I.  Geological  map  of  a  portion  of  southern  Canada 21 
II.  Geological  map  of  the  Original  Huronian  rocks 34 
III.  Geological  map  0f  the  lake  Superior  region 52 
IV.  Geological  map  of  northern  Canada 210 
V.  Geological  map  of  New  Brunswick,  Nova  Scotia,  and  part  of  Quebec..  224 
VI.  Geological  map  of  Newfoundland 248 
VII.  Geological  map  of  portions  of  Montana,  Idaho,  Wyoming,  and  Dakota.  258 
VIII.  Geological  map  of  Utah  and  Nevada 286 
IX.  Geological  map  of  portions  of  Colorado  and  New  Mexico 308 
X.  Geological  map  of  Arizona  and  part  of  New  Mexico 320 
XI.  Geological  map  of  the  northeastern  states 348 
XII.  Geological  map  of  the  southeastern  states 410 
