CONTENTS 
Page. 
Letter  of  transmittal 11 
Outline  of  this  paper 13 
Preface, 15 
Introduction 19 
Chapter  I.     The  Original  Laurentian  and  Huronian  areas 23 
Section  I.     Eastern  Ontario  and  western  Quehec 23 
Literature. . . 23 
Summary  of  results 32 
Section  II.     From  north  channel  of  lake  Huron  to  lake  TemLscamang 35 
Literature 35 
Summary  of  results .- 46 
Notes... 48 
Chapter  II.     Lake  Superior  region 51 
Section  I.    Work  of   the  official  geologists  of  the  Canadian  Survey  and 
associates 51 
Section  II.     Work  of  the  early  United  States  geologists  and  associates  ...  72 
Section  III.     Work  of  the  Michigan  geologists  and  associates 88 
Section  IV.     Work  of  the  Wisconsin  geologists  and  associates 105 
Section  V.     Work  of  the  Minnesota  geologists  and  associates 119 
Section  VI.     Work  of  the  later  United  States  geologists  and  associates. ..  134 
Section  VII.     Summary  of  results 156 
Lake  Superior  sandstone 157 
The  character  of  the  Keweenaw  series 160 
Relations  of  Keweenaw  and  underlying  series 161 
General  succession  according  to  different  writers 162 
Lithological  characters  of  Azoic,  Laurentian,  Huronian,  etc 167 
Origin  of  the  iron  ores 170 
The  basic  eruptives  and  stratigraphy 173 
Unconformity  at  base  of  clastic  series 174 
Unconformity  within  clastic  series 179 
Correlation ;  general  considerations 183 
Equivalents  of  the  Original  Huronian  series 184 
Equivalents  of  the  Sioux  quartzites,  St.  Louis  slates,  etc 186 
Succession  and  equivalents  of  the  Penokee   and  Animikie  districts 
series 187 
Succession  and  equivalents  of  the  Marqiiette  district  series 189 
Succession  and  equivalents  of  the  Menominee  and  Felch  mountain 
districts  series 190 
Equivalents  of  the  Black  river  falls  series 190 
Succession  andequivalents  of  western  Ontario  and  northeastern  Minne- 
sota series 190 
Nomenclature 191 
Lake  Superior  basin 190 
Conclusion 196 
Notes 199 
6 
