CONTENTS. 



INTRODUCTION 



1 



THE IRON DISTRICT 1-76 



Historical 1-26 



HisTOiucAL Summary 20, 27 



Metiioi>s of Orservation . 



^1 28 



The Jasi'kr a^^v^ Iron Ore 28-36 



The Basic Intrusive Rocks, Schists, and Felsite 



30-49 



" Soft Hematites " 49-52 



Granite, Gneiss, and Quart/ite 



Potsdam Sandstone 



52-60 

 GO 



Fkrido'iitk and Serpentine GO-66 



General Discussion and Results 



00-76 



THE COPPER D' STRICT 76-132 



Historical 76-107 



Historical Summary 107-109 



The Traps 109-113 



The Sandstones and Congloinierates 

 The Veins and Copper Deposits . . 

 Conclusions 



4 



» 



113-122 

 123-127 

 127-132 



BIBLIOGRAPHY 133-157 



DESCRIPTION OF THE PLATES 159-164 



