INDEX. 



1087 



■Wonn-lrarrows, Archsean, 446 ; 

 Cambrian, 464, 470, 477*, 4S0 ; 

 Hamaton, 593 



Worms, Sea, 59 ; trails of, 95 ; work 

 of common earth-, 156 ; charac- 

 teristics of, 418, 419, 420*, 423§, 

 437; Cambrian, 469, 474, 477*, 

 4S7 



Wrangel Bay, 747 



Wright, Mt., 238 



Writing slate. See Roofing slate 



Wyoming, height of, 23, 29, 85, 

 338, 360, 365, SOS ; Archa>an, 449 ; 

 Cambrian, 466, 476 ; Subcarbonif- 

 erous, 639 ; Coal-measures, 662 ; 

 Triassic, 746, 747 ; Jurassic, 748, 

 760, 761, 763, 767, 768; Creta- 

 ceous, 825 (coal), 826, 828 (coal). 

 845, 847, 848, 849, 876 ; Tertiary, 

 882, 886, 893, 894, 906, 907 ; Gla- 

 cial, 945 



Xanthidia, 582, 583*, 859 

 Xenoneura antiquorum, 600* 

 Xiphodon, 924, 926 ; gracilis, 924*, 



926 

 Xylobius, 701 ; fractus, 691 ; Ma- 



zonus, 691 ; similis, 691 ; sigiUa- 



riae, 678*, 682, 691, 703 

 Xystrodus, 692 



Tablonoi Mts., 82 

 Tang-tse-Kiang, 30, 198 

 TeUow ocher, 71§, 126 



Yellow Kiver, China. See Hoang 

 Ho 



Yellow Sea, 198 



Yellowstone Lake, 200, 306 



Yellowstone National Park, 29, 30 ; 

 geysirite, 82, 152 ; Obsidian cliff, 

 84, 263; Death Gulch in, 128; 

 calcareous deposits or travertine, 

 79, 131, 152 ; volcanic peaks of, 

 296; lithophyses in, 337; time 

 of eruptions, 876, 937 ; geyser 

 region, hot springs, etc., 135, 305, 

 30C* ; siliceous Algse, 152 



Yellowstone Eiver, 29, 266, 830, 

 937 



Yenisei Eiver, 30 



Yews, 53, 485, 596, 689, 666, 678, 

 685, 71S, 735 



Yoldia, 760, 917 ; arctica, 984, 995, 

 997; Claibornensis, 915; eborea, 

 915 ; glacialis, 983, 984 ; limatula, 

 917, 9.84 ; sapotilla, 917 



Yoredale group, 695 



Yorktown epoch, 884, 891, 899* 



Yo Semite domes, origin of, 260 



Yosemite valley, 810 



Ypresian group, 925 



Yttrium, 449 



Yucatan, 40, 44 



Yukon district, 818, 868 



Zambesi Eiver, 80, 33 



Zamia, 434, 750 



Zamites acutipennis, 883, 884 ; aper- 



tus, 8.34; borealis, 834; Montana, 

 833, 834 ; occidentaUs, 756 



Zanclean beds, 927 



Zanskar district, 456, 791 



Zanzibar, 33 



Zaphrentis, 515, .516, .5.51, 552, 562, 

 579, .591, 597, 611, 640, 674, 700, 

 718 ; bilateralis, .54.5*, .550 ; Cana- 

 densis, 515 ; Edwardsi, .590 ; gi- 

 gantea, 584*, 590. 591 ; Halli, 601 ; 

 minas, 646 ; prolifica, .590 ; Eafi- 

 nesquii, 584*, 590 ; simplex, 601 ; 

 spinulosa, 646 



Zeacrinus, 646, 690 



Zebra, 54 



Zechstein, 697, 707 



Zeolites, 68, 78, 312 ; at Plombiferes, 

 328 ; origin of, 336 



Zermatt, glacier of, 237* 



Zero-strain, depth of, 384, 385, 387 



Zeuglodon, 822, 908§, 912, 923, 931 ; 

 cetoides, 908* 



Zinc ores, 70, 340, 342, 449, 542 



Ziphias, 144 



Zircon, 67§, 85, 455 ; syenyte, 85§, 

 447 



Zirconia, 67 



Zirconitic granite, 83 



Zirconium, 449 



Zizyphus tibrillosus, 839 



Zoantharia, 431 § 



Zoisite, 66§, 88, 318 



Zones, 407§ 



Zygospira modesta, 514, 516 



