
INDEX 
Imbricated structure of sedimentary 
rocks, III, 315 
Impounded streams, 348 
Impregnations, 252, 260 
Inclination of strata, 157 
Inclusions in minerals, 4, 37, 43 
Incrustation of fossils, 91 
Index-beds, 287 
Injection-plexus, 207 
Inliers, 178 
Insolation, 57, 58, 152, 369 
Interbedded igneous rocks, 208 
Intermediate igneous rocks, 40 
Intersection of faults, 169; of lodes, 242 
Intervals indicated by planes of bedding, 
109 
Intratelluric stage of consolidation, 35 
Intrusive rocks, 184 
Inversion, 138 
Tolite, 25 
Iron-hat, 249, 256. See Gossans 
Iron ores, 229, 230, 231, 232, 235, 236, 
249, 258, 264 
Ironstones, 67 
Irregular ore-formations, 258 
Islands, fringing or marginal, 424 
Isoclinal folds, 138 
Italy, crater lakes of, 422 
JACYNTH, 8 
Japan, 265 
Jargoon, 8 
Jasper, 5 
Jasp-opal, 6 
Joints, 144; influence of changes of 
temperature upon, 145; in bedded 
rocks, 145; in igneous rocks, 147, 
198, 204; in schistose rocks, I§0; 
origin of, 150 
Jordan Valley, 414 
Jura Mountains, 397 
KAMES, 316 
Kankar, 122 
Kaolin, 62, 126 
Kaolinite, 26, 62 
Keeweenaw Point, copper of, 262 
Kentallenite, 46 
Kersantite, 48 
437 
Kidney-ore, 6 
Klapperstein, 122 
Knotted slate, 76 
Kugel-granit, 124 
Kupferschiefer of Mansfeld, 263 
Kyanite, 26 
LABRADORITE, 12, 13 
Laccoliths, 191, 195, 402 
Lac d’Aydat, 420 
La Celle, tufa of, 98 
Lacustrine deposits, 318 
Ladoga, Lake, 419 
Lake Caledonia, 373 
Lake Superior, copper, 262 
Lakes, 348, 419 
Lamellated lodes, 245 
Lamination, 107 ; diagonal, 115 
Landscape-marble, 123 
Lapilli, 53 
Lateral secretion of ores, 269 
Laterite, 58 
Laurvikite, 46 
Lava, consolidation of, 35 
Law of mineral combination in igneous 
rocks, 39 
Layers, 108 
Leached guano, 72 
Lead ores, 249, 256, 269 
Leaf-by-leaf injection, 188 
Lee-seite, 314 
Leucite, 13 ; -basalt, 52, 89; -phonolite, 
48 
Leucitite, 52 
Leucitophyre, 48 
Leucoxene, 7, 25 
Level-course in coal mines, 147 
Level-of-no-strain in earth’s crust, 142 
Lherzolite, 52 
Lias, 115, 232 
Liebenstein, dyke at, 206 
Lignite, 71 
Limburgite, 52, 89 
Limestones, 69, 82; 
hzematite, 260 
Limonite, 7, 67, 231 
Liparite, 43 
Lithomarge, 26 
Liver-quartz, 372; -rock, 60 
Llanos of S. America, 412 
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