INDEX. 
mian, 751, 755; Eocene, 851; Pleis- 
tocene, 883 
Glacial detritus, 414, 415 
Glacial Period, history of, 883; influence of 
upon mammalian fauna of the globe, 894; 
limits of, 902; second glaciation of, 892 ; 
still exists in Norway, &c., 902 
Glaciers, formation of, 403; motion of, 403; 
advance and retreat of, 406; of the first 
order, 406; of the second order, 406; re- 
cemented (remaniés), 407; geological 
work of, 408; transport by, 408; ponding 
back of rivers by, 369; former greater 
extent of, 413, 884; erosion by, 413, 418, 
885 ; of the present time are descendants 
of those of Ice Age, 884, 887, 894 
‘ Glacier-ice, nature of, 110 
Glacieres or ice-caves, 346 
Glarnisch, inversion of, 518 
Glass, a product of fusion, 293; lower 
density of, 293, 294; contraction of in 
cooling, 295; meteoric decomposition of, 
333 
Glassy or vitreous minerals, 60; rocks, 99, 
104 
Glauconite, 82, 159; formed off Carolina, 
82; as an agent in fossilization, 610 
_ Glauconitic strata, 802 
Glauconome, 669, 723 
Gleichenia, 803 
_Glengariff grits, 717 
Glens, subaerial origin of, 283 
Glimmer (mica), 73 
Globigerina, 803* 
Globigerina-ooze, 167 
Globulites, 101 
Glossopteris, 749 
Glossozamites, 772 
Glutton (Gulo), 875, 891, 906 
Glyptarca, 655 
Glypticus, 797 
Glyptocrinus, 664 
Glyptodendron, 662 
Glyptolemus, 710 
Glyptolepis, 710 
~ Glyptopomus, 710 
Glyptostrobus, 862, 870* 
Gneiss, 124, 126; Archean, 637; Silurian, 
585, 672; relation of to granite, 308, 587 
Goldau, landslip at, 358 
Gomphoceras, 686, 698 
Goniaster, 821 ; 
Goniatites, 698, 721, 724, 725* 
Goniomya, 792 
Goniopholis, 776, 808 
Goniophora, 665, 679* 
Gosau Beds (Cretaceous), 830 
Gourd, early forms of, 838 
Grahawm’s Island, a submarine volcano, 250, 
255 ; 
Grammysia, 678, 697 
Granite, petrographical characters of, 103, 
131; order of appearance of minerals in, 
295; passage of into felsite and vitreous 
949 
porphyry, 134; relations of to gneiss, 
308, 587; depth of origin, 97; tempe- 
rature of consolidation, 296; formed 
under pressure, 297, 540; influence of 
fluorine in crystallization of, 295, 302; 
aquo-igneous origin of, 296 
Granite (continued), Geotectonic characters 
of,—bosses, 539; veins, 552, 557; rela- 
tions to surrounding rocks, 541; some- 
times schistose, 557; occasionally itself 
of metamorphic origin, 544; connection 
with volcanic rocks, 544; actual exposure 
at the surface, the result of enormous 
denudation, 540, 917 
Weathering of, 178, 335; absorbent 
power of for water, 299 
Granitite, 134 
Granitoid structure, 89, 150 
Granophyre, 90 
Granular-crystalline structure, 87 
Granular structure, 88 
Granulite, 125, 126, 134 
Graphite, 63, 173, 639 ; 
Graptolites as type-fossils, 615; of Silurian 
system, 663, 667 
Graptolithus (Monograptus), 663 
Gravel, 155 
Great Basin of North America, 327, 395 
Great Oolite, 792 
Great Salt Lake (see Salt Lake, Great) 
Greece, Pliocene deposits of, 878 
Green, as a colour of rocks, 92 
Greenland, effects of frost in, 401; glaciers 
of, 404, 416, 417; Cretaceous rocks of, 
803, 831; Tertiary, 868 
Green River Group, 853 
Greensand, 159 . 
Greensand, Lower, 818; Upper, 819 
Green slates and porphyries of Lake Dis- 
trict, 670 
Greenstone, 142, 148 (see Diorite) 
Gres, 158 
Gres bigarré, 767 
Gres des Vosges, 758 
Gresslya, 774 
Grevillea, 845 
Grey Chalk, 820 
Greywacke, 159 
Greywacke-slate, 160 
“ Grey Wethers,” 158, 333, 342 
Griffithides, 724 
Grit, 158 
Ground-ice, 111, 402, 425 
Ground-mass of rocks, 87, 90, 101, 104 
Ground-swell, effects of, 422 
Group or stage, defined, 635 
Grundmoriane, 411, 417, 888 
Gryllacris, 732 
Gryphzxa, 774, 776* 
Gryphite Limestone, 774 
Guano, 169, 471 
Gulf-stream, characters of, 27; influence 
of, 426 
Gum-trees, fossil (see Eucalyptus), 838, 855 

