TABLE OF CONTENTS. ix 



PAGE 



pie 50a, Sulphur Bank, 268; Example 506, Steamboat Springs, 268- 

 269 ; nickel and cobalt, 269-272 ; platinum, 272 ; tin, 273-274 ; Ex- 

 ample 51, Black Hills, 273 267-273 



CHAPTER XVI. CONCLUDING REMARKS. 



Summation of such general geological relations among North 

 American ore deposits as can be detected 275-277 



ADDENDA. Wadsworth's scheme of classification of ore deposits, 279 ; 

 J. P. Kimball on the genesis of spathic ores, 279 ; bog ores of the 

 Three Rivers district, Province of Quebec, 280 ; iron ores of Arkan- 

 sas, 280 ; titaniferous magnetites, 281 ; the origin of magnetite 

 as segregated veins, 282 ; Cambrian at St. Genevieve, Mo., 283 ; 

 C. R. Boyd on zinc mines at Austinville, Va., 283 ; W. Lindgren 

 on the American and Yuba rivers, California, 283 ; Posepny's 

 great paper on the origin of ores, 283 ; Fuchs et De Launay, Traite 

 des Gites Mineraux et Metalliferes, Paris, 1893, 285. 278-285 



