238 ILLUSTRATIONS. 



Page. 



Plate IV. A, B, Marine forssila of Cretaceous age; C, Carboniferous forest 20 



V. Animals that lived in central North America in Cretaceous time: 



A, Skeleton of the head of Hesperornis; B, Restoration of a 



mosasaur; C, Restoration of a pterodactyl *. . - 21 



VI. Rocks of Miocene age and restorations of animals that lived in 



North America during the Miocene epoch: A, Short -limbed 

 rhinoceros, known as Teleoceras; B, Miocene mastodon and 

 Pleistocene elephant; C, Moropus elastus; D, A four-homed 

 deer; _E, Gigantic giraffe-camel; F, Miocene beds (Arikaree 

 formation) resting unconformably on Oligocene beds (Brule 



clay) in Pawnee Buttes, Colo -' 40 



VII. Rocks of Oligocene age and restorations of animals that lived in 



central North. America during the Oligocene epoch: Ay Jail 

 Tock, north of Sidney, in western Nebraska; By An American 

 rhinoceros; C, ''Giant pigs"; D, Titanotheres; E, Protoceras 



celer - 41 



VIII. A, View near Dale Creek station, Wyo., showing characteristic 



weathering of the Sherman granite; J5, Small **soda lake'' on 



^ 



the plain near Laramie, Wyo 44 



IX. Natural monuments on the plain near Red Buttea, Wyo., eroded 



from red sandstone of the Casper formation 45 



X. A, An armored dinosaur (Stegosaunis); B, A carnivorous dinosaur 



(Allosaurus) preying on one of the herbivorous dinosaurs 52 



XI. Aj A horned toad, a modern lizard that is armed like some of the 



ancient dinosaurs; B, The last of the dinosaurs (Triceratops). , 53 

 XII. Ay Platte River at Fort Steele, Wyo.; B, Elk Mountain, the north 



end of the Medicine Bow rani^e 60 



XIII. Ay Gap in the Cambrian quartzite through wMch the westbound 



tourist passes after lea\ing Rawlins, Wyo.; B, Characteristic 



view of the Red Desert - 61 



XIV. A^ Table Rock, near Bitter Creek, Wye; B, Characteristic view 



of the north wall of the canyon through which the tourist 



passes near Point of Rocks, Wyo 66 



XV. A J Coal-bearing sandstone of the Mesaverde formation; B, Trans- 

 portation, old and new; C, Near view of White Mountain 67 



XVI. Major J. W. Powell 



XVII. A, Green River City, Wyo., as seen from Castle Rock; B, Natural 



monuments west of Castle Rock 



XVIII. Ay ''Fish Cut," west of Green River City, Wyo.; B, Bluffs of the 



72 



73 



Green River formation near Green River City, Wyo 74 



Fossils from the Green River formation; JL, Fossil fish; B, Fos- 

 sil plant 75 



Ay A creodont, an ancient doglike animal, one of the ancestors of 

 the carnivorous mammals of to-day; By Eobasileus, one of the 

 types of animals that became extinct ages ago 80 



A, Geologic features seen from Evanston, Wyo.; By Details of 

 prominent hill at left of \dew shown in ^ 81 



XXII. A, "Steamboat Rock/' in Echo Caayon, Utah; B, "The Nar- 



roi»^," in Echo Canyon, Utah 



XXIII. A, North wall of Echo Canyon, Utah, at its junction with Weber 



84 



Canyon; By Pulpit Rock at Echo, Utah ., 85 



