436 



INDEX 



Garnet group, 24 

 Garnet-hornfels, 79 

 Gash- veins, 259 



Geanticline, 140, 397 



Geodes, 42, 125 



Geological maps and sections, 21 

 Geological structure, economic aspects 

 °f. 330, 347 ! surface-features deter- 

 mined by, 393 



Geological surveying, 273 



Geosyncline, 141, 419 



Geyserite, 6 



Giant granite, 42 



Glacial basins, 421 



Glacial rocks, 62, 310 



Glacial soils, 385, 388 



Glaciated lands, frequency of waterfalls 

 in, 418 



Glacier lakes, former, 316 



Glacio-aqueous clay, 61 



Glass in lavas, 35 



Glen App, 414 



Gneiss, 77 ; soil derived from, 381 



Gold, 27, 229, 232, 250, 261, 265, 266 



Goroblagodat, contract ore of, 265 



Gossans, 248, 337 



Grain of granite, 152 



Granite, 41, 87 ; batholiths of, 186 ; 

 joints in, 147 ; rift or grain of, 152 ; 

 secretions in, 126 ; soil derived from, 

 378 ; xenoliths in, 188, 218, 222 



Granite-gneiss, 42, 77, 227 ; -porphyry, 

 42 



Granitite, 42 



Granitoid structure, 41 



Granophyre, 43 



Granophyric structure, 42, 50 



Granulite, 78, 382 



Graphic granite, 42 



Graphite, 31, 72 



Graphite-gneiss, 77 



Great Oolite, ores of, 232 



Greece, indented coast of, 423 



Greenland, plateau-basalts of, 21 1 



Greensand, 61 ; phosphatic nodules of 

 Upper, 73 ; iron ores in Lower, 232 



Greisen, 42 



Greywacke, 61 



Grey-wethers, 378 



Grit, 60 



Groundmass, 35, 36 



Guano, 72 



Gypsum, 29, 66 ; concretions of, 123 



Hade of faults, 154, 159; of lodes, 237 



Haematite, 6, 67, 259 



Haloids, 27 



Hammers, geological, 275 



Hanging-wall, 237 



Haplite, 42 



Harz Mountains, 401 ; ores of, 266 



Haiiyne, 14 ; -phonolite, 48 



Heave of faults, 157, 159 



Heavy spar, 29 



Heliotrope, 5 



Hemicrystalline igneous rocks, 35, 84 



Henry Mountains, laccoliths of, 191 



Highlands (Scottish), relict mountains 



of, 407 

 Himalayas, 143, 176, 397, 401 

 Holocrystalline rocks, 34, 36 

 Horizontal or profile sections, 325 

 Hornblende, 17 ; -andesite, 49 ; -basalt, 



51; -gabbro, 49; -gneiss, 77; 



-granite, 42 ; -rock, 78 ; -schist, 78, 



89 

 Hornfels, 77, 79, 217 

 Hornstone, 5, 67 

 Horst mountains, 179, 401 

 Hungary, ores of, 251, 265 

 Huron, Lake, 419 

 Hyalite, 6 



Hydro-chemical metamorphism, 222 

 Hydro-haematite, 6 

 Hydro-mica-schist, 88 

 Hypabyssal eruptive rocks, 184 

 Hyperthene, 1 8 ; -andesite, 49 ; -basalt, 



51 ; -dolerite, 50 

 Hypidiomorphic (subhedral) minerals, 



36 



Iceland, plateau-basalts of, 211 

 Idiomorphic (euhedral) minerals, 36 

 Igneous rocks, classification of, 40 ; 

 geological structure of, 184, 202 ; 

 general character of, 33 ; mineral 

 ingredients of, 36 ; mutual relations 

 of, 45, 48, 51 ; ores in, 229; secre- 

 tions in, 124 ; soils derived from, 378 

 Ilmenite, 6, 229 



