CONTENTS.  5 
Page. 
Chapter  III.  Lake  Superior  region — Continued. 
Section  6.  Summary  of  present  knowledge  of  Lake  Superior  region — 
Continued. 
General  structure  and  distribution  of  Lake  Superior  rocks 347 
Fossils  in  Lake  Superior  pre-Cambrian 349 
Unconformity  beneath  the  Cambrian 349 
Unconformity  beneath  the  Keweenawan 1 351 
Unconformity  beneath  the  upper  Huronian,  or  Animikie 352 
Unconformity  beneath  the  Ajibik  quartzite  (middle  Huronian )__  353 
Unconformity  beneath  the  Huronian  series 353 
Correlation 356 
Correlation  of  Lake  Superior  rocks  with  one  another 356 
Correlation  of  Lake  Superior  rocks  with  original  Huronian 
rocks  on  north  shore  of  Lake  Huron 360 
General  correlation 360 
Section  7.  History  of  development  of  knowledge  of  Lake  Superior 
region 362 
Lake  Superior  sandstone 362 
Character  of  the  Keweenawan  series 365 
Relations  of  Keweenawan  and  underlying  series 367 
General  succession  according  to  different  writers 367 
Definitions  of  "Azoic,"  Laurentian,  Keewatin,  Archean,  Huronian, 
etc 376 
"Azoic  " 376 
Laurentian 376 
Keewatin 377 
"  Coutchiching  " 378 
Archean 378 
Huronian 379 
Animikie 380 
Basic  and  acidic  eruptives 380 
Keweenawan , 381 
Basic  eruptives  and  stratigraphy _ : 381 
Unconformity  beneath  the  Animikie  or  upper  Huronian 382 
Unconformity  beneath  the  Huronian  series 384 
Notes , 386 
Chapter   IV.  Area   north  and  northeast  of   Lake  Huron,   including  the 
original  Huronian  district 403 
Summary  of  literature . 403 
Summary  of  present  knowledge 435 
North  shore  of  Lake  Huron 435 
Logan  and  Murray's  work 435 
Developments  subsequent  to  Logan  and  Murray's  work 437 
Unconformity  within  the  Huronian 437 
Thickness  of  the  Huronian  sediments 438 
Relations  of  Huronian  sediments  to  underlying  rocks 438 
Sudbury  district 439 
Lakes    Temiscaming    and    Temagami    and    westward    to    Lake 
Onaping 439 
General  correlation  and  nomenclature  of  Huronian  series 441 
Notes 444 
