INDEX. 



293 



Hysteromorphic deposits, 284. 



Ibapah range, Utah, 225. 



Ice, veins of, on Mount McClellan, 



Colo., 211. 

 Idaho, geology, 222. 



Lead-silver ores, 191, 192. 

 Tin, 274. 



Idaho Springs, Colo., 214. 

 Iddings, J. P , on basaltic columns, 



12. 

 On the Comstock Lode, 233, 236, 



237. 



Idiogenites of Posepny, 284. 

 Igneous rocks, defined and roughly 



classified, 6. 

 Forms assumed by, 11. 

 Illinois lead and zinc mines, 161. 

 Independence, Colo., 211. 

 Ingersoll granitic knob, with tin ore, 



273. 



International Geological Congress, 

 1885, c assiflcation recommend- 

 ed by, 3, 4. 



Inyo Co., Cal., antimony, 259. 

 Iowa lead and zinc mines, 161. 



Limonite, 79. 

 Ireland, bog ore, 75. 

 Iridium, with platinum, 272. 

 Iron Co., Utah, 226. 

 Magnetite, 128. 



Literature, 128. 

 Iron hat, 38. 



Iron Hill, Leadville, Colo., 183. 

 Iron in rocks, 72. 



Iron King iron mine, Colorado, 126. 

 Iron Mountain, Colo., 126. 

 Iron Mountain, Missoula Co., Mont., 



222. 



Iron Mountain, Mo., 116, 130. 

 Bibliography, 118, 119. 

 Illustration of subae' rial decay, 59. 

 Porphyries., 117. 

 Iron ores, bibliography of general 



papers, 69. 



Brown hematite ore, 73-85. 

 General remarks on, 70-73. 

 Impurities, 71. 



Iron ore, magnetite, 119-130. 

 Iron ore localities : 



Adirondack Mountains, 120-122. 

 Alabama, 78, 84. 



Clinton ore, 95, 96. 

 Arkansas, Addenda. 

 Colorado, 79, 89. 



Hall's Valley and Handcart 



Gulch, Park Co., 74. 

 Connecticut, 80-85, 91. 

 Georgia, 84. 



Clinton ore, 95. 

 Hesse, Germany, 75. 



Iron ore localities : 

 Iowa, 79. 

 Ireland, 75. 

 Kentucky, 77, 78, 88. 



Clinton ore, 93. 

 Louisiana, 79. 

 Maryland, 82. 



Clinton ore, 94. 

 Massachusetts, 80-84, 89. 

 Michigan 78. 



General outline, 100. 



Marquette district, 102-105. 



Menominee district, 107, 108. 



Penokee-Gogebic district, 108. 

 Minnesota, 78. 



Vermilion district, 110, 111. 



Mesabi range, 111. 

 Missouri, 78. 



Cambrian, 99. 



Iron Mountain, 116. 



Lower Carboniferous, 98. 



Pilot Knob, 114. 

 Mississippi, 89. 

 Montana, 89. 



Great Falls, 74. 

 New Jersey, 81. 

 New York, 80, 85, 



Burden Mines, 89. 



Clinton ore, 93. 



Jefferson Co., 99. 



Rye, 74. 



Staten Island. 74. 



Wawarsing, 91. 

 North Carolina, 74, 84, 89. 



Specular, 114. 



Nova Scotia, Clinton ore, 97. 

 Ohio, 78, 88. 



Clinton ore, 92, 93. 

 Oregon, Port Townsend Bay, 



Portland, 74, 75. 

 Pennsylvania, 87. 



Adams Co., 85. 



Blair Co , 77. 



Carbon Co., 77. 



Franklin Co., 76, 77. 



Fulton Co., 77. 



Huntingdon Co., 76,77. 



Juniata Co., 77. 



LehighCo., 81, 84. 



MifflinCo.,77. 



Perry Co., 77. 



York Co., 81,84, 85. 



Clinton ore, 93. 



Mansfield orps, 98. 

 Quebec, Three Rivers, Addenda. 

 Tennessee, 78, 82. 



Clinton ore, 94. 

 Texas, 78. 

 Utah, 79. 

 Vermont, 80. 



