x ii ILL US T RAT 10 NS. 



No. Page 



50. A Carboniferous Cepbalopod (Goniaiites AUei) 116 



51. A Mesozoic Cephalopod (Baculites ovatiis) 117 



52. An Ammonite (Ammonites canaliculatus) 119 



53. Plans of Septa among Chambered Shells 119 



54. Garpikes of North America 120 



55. The Continent at the end of the Silurian Age 123 



56. An Upper Silurian Sea-weed (Arthrqphycus Harlani) 124 



57. Ideal Landscape of the Devonian Age \ 130 



5S. Trends of the great Limestone Masses of the United States 135 



59. Portrait of Hugh Miller, the Scottish Geologist ■. 137 



60. Miners going down a Shaft 140 



61. View in an English Coal Mine , 142 



62. Explosion in a Coal Mine 144 



63. Miner at Work— old manner of working. 140 



64. Coal-plants on Shale „ „. 147 



65. Ideal Landscape of the Coal Period 150 



66. Eemains of a Lepidodendron 157 



67. Vertical Tree- trunks in a Coal Mine , 159 



68. The Continent at the end of Paleozoic Time. 162 



Frond of an ancient Tree-fern {Pecopteris) 163 



69. Labyrinthodon (restored) 172 



70. Ideal Landscape of the Age of Eeptiles 177 



71. Ichthyosaur and Plesiosaur in Conflict < . 179 



72. Haunts of the Pterodactyl 181 



73. Footprints from the Connecticut Valley 1S3 



74. A Three-toed Eeptile (restored) 184 



75. Tooth of an extinct New Jersey Saurian 192 



76. A gigantic extinct Eeptile of North America (Haclrosauriis Foulki) 193 



77. The Continent at the end of Mesozoic Time 200 



78. The Bad Lands of Dakotah 206 



79. Portrait of David Dale Owen, the eminent Western Geologist 211 



80. Great Glacier, Bute Inlet, Alaska - 216 



81. Glacier Furrows and Scratches in Michigan 21S 



82. River issuing from a Swiss Glacier 223 



83. Phenomena of Wells and Springs in Drift Materials 233 



84. Former High Waters of the Great Lakes 244 



S5. Sugar Loaf, Mackinac Island 247 



86. Arched Rock, Mackinac Island 24S 



87. Mining Cedar Logs in a buried Swamp 258 



88. The Noble Oil Well, Pennsylvania. 274 



89. Blowing and Flowing Oil Wells '. 285 



90. View of the Salt Works, Mason City, West Virginia 294 



91. Section across the Lower Peninsula of Michigan 299 



92. Section of the Onondaga Salt Basin, New York 303 



93. Portrait of Professor James D. Dana 312 



94. A Reminiscence of the Trilobites (Glyptonotus antarcticus) 322 



95. Section across the Basin of Middle Tennessee 342 



96. Upper Cataract Creek, near Big Canon, Colorado = 346 



97. Big Canon of the Colorado 348 



98. Pre-historic Man and Scenes 351 



99. Extinct giant Elk compared with Man 355 



100. Engraving by a Pre-historic Artist — the Hairy Mammoth 358 



101. The Hairy Mammoth (restored) 359 



