952 
Interbedded eruptive rocks, 535, 562 
Tnterglacial Beds, 890, 899 
Interglacial periods, 29, 890 
Tntrusive eruptive rocks, 535, 538 
Iuversion of strata, 518, 616, 746 
Inzer:dorf Tegel (Vienna basin), 877 
Tolite, 79 
Treland (see Britain) 
TIriartea, 846 
Tron, 59, 64, 67; native in rocks, 64; 
in meteorites, 9, 64; flow of solid, in 
‘Tresca’s experiments, 313; oxides, 67, 
115, 174; oxidation of in minerals, 332; 
deposits of oxide from springs, 350, 
354; in bogs, 462 ; beds of as indications 
of former organic action, 465; titanic, 
69; carbonate, 83, 116, 175, 350; phos- 
phate, 84; sulphate, 350; di-sulphide, 
85, 352; bog ore, 174 
Iron Age or Period, 902 
Iron-ore in Archean rocks, 639 
Ironstone, 115; with coal and shale, 720; 
and organic remains, 720 
Irrawaddy, mineral matter in water of, 
370 
Isastrea, 773* 
Ischadites, 663 
Ischia, volcanic history of, 209 
Ischyodus, 775 
Ischyosaurus, 795 
Isocardia, 806, 876 
Isoclinal structure, 518, 746, 915 
Isogeothermal lines or Isogeotherms, 46, 
287, 289 
Isotelus, 678 
Isothermal lines or Isotherms, 426 
Isotropic crystals, 100, 189 
Itacolumite, 128 
Italy, oscillation of level of, 281; delta 
formation, 390; temperature of lakes, 
392; late upheaval, 870; volcanoes of 
Central, 209, 240, 259; Pliocene de- 
posits of, 871, 877; erratic blocks of, 
412 
Janassa, 744 
Janira, 820, 878 
Jasper, 117 
Java, volcanic phenomena of, 206, 217, 233, 
242; Valley of Death in, 235 
Joints, cause of, 315; in stratified rocks, 
501; in massive rocks, 505; in schistose 
rocks, 508; influence of in the formation 
of waterfalls and ravines, 376, 379; of 
sea-cliffs, 483 ; importance of in scenery, 
924 
Jolly’s spring balance, 93 
Jorullo, lava of, 230 
Juglans, 846, 859, &62 
Jupiter, planet, 8 
Jura mountains, erratic blocks of, 412,413; 
structure of, 913, 915 
Jurassic system, 771; alternation of strata 
in, 490, 498, 773 
INDEX. 
Kames, 892 
Kampecaris, 710 
Kanda, delta of in Lake of Thun, 385 
Kao'in, 81; resulting from rotted granite, 
336 
Kellaways Rock, 793 
Kentucky, Mammoth Cave of, 356 
Keokuk Group, 750 
Keuper Sandstones, 764 
Khotan, dust-drift of, 322 
Kieselsinter, 117 
Kimmeridgian, 794, 797 
Kinderhook Group, 750 
Kingena, 818 
Kinzigite, 125 
Kirgis Steppe, salt deposits of, 111 
Kirkby Moor flags, 684 
Kirkbya, 724 
Kirthar Group, 853 
Kissingen, mineral water of, 351 
Kjokken-médding, or shell-mounds of ) 
Denmark, 909 
Knorria, 700, 728 
Knotenschiefer, 122, 580 
Koli Group, 688 
Kossen Beds, 769 
Kressenberg Beds, 852 
Kupferschiefer, 751, 759 
Kutorgina, 652 
Kyanite-rock, 125 

Labrador, anchor-ice of, 425; temperature 
of, 426 
Labrador-porphyry, 145 
Labradorite, 72 
Labyrinthodonts, 732, 753, 763 
“ Laccolites”’ of Utah, 546 
Laccopteris, 828 
Lacertilian reptiles, early forms of, 754, 
763 
Lacustrine deposits (see Lakes) 
Lekenien, 850 
Lelaps, 811 
Lago Maggiore, depth of, 392 
Lago Sabatino, temperature of, 392 
Lagomys, 876 
Lagoon-barriers, formation of, 385 
Lake Bonneville (ancient extension of 
Great Salt Lake), history of, 395 
Como, erratics around, 412 
Erie, future lowering of, 378 
Geneva, temperature of, 392; sub- 
aqueous terraces of, 394; alleged lower 
level of, 394 
Huron, terraces of, 901 
——— Lahontan (Utah), 395, 400 
—— Lucerne, crumpled rocks of, 520 
—— Michigan, dunes of, 324 
Neufchatel, erratics of, 412 
Superior, area of, 392, dunes of, 392; 
terrraces of, 393, 901 
Thun, alluvium of, 385 
Lake-dwellings, 909 
Lake-ore, 74 







