xiv LIST OF ILLUSTRATIONS 



FIGURE PAGE 



153. Structure section across Nebraska from the Rocky Mountains to 



Omaha 249 



154. Structure section in the Rocky Mountains of western Montana 



showing moderate folding of Cretaceous and older rocks .... 250 



155. Diagrammatic section through the Atlantic slope at about the lati- 



tude of northern New Jersey, showing the structures and rela- 

 tions of the various physiographic provinces as they now exist. 251 



156. Sketch map showing the relations of land and water in Europe 



during Lower Cretaceous time 253 



157. Sketch map showing the relations of land and water in Europe 



during early Upper Cretaceous time 254 



158. Cretaceous Foraminifers, greatly enlarged 257 



159. A Cretaceous Brachiopod, Terebratula harlani 257 



160. Typical Cretaceous Pelecypods 259 



161. Typical Cretaceous Ammonites 260 



162. A Cretaceous Teleost Fish, Osmeroides Lewesiensis, restored . . 261 



163. A Cretaceous toothed Bird, Ichthyornis victor 262 



164. A group of Ichthyosaurs, Ichthyosaurus quadricissus, of the Enalio- 



saur division of Mesozoic Reptiles 264 



165. A well-preserved Ichthyosaur found in Germany 265 



166. A restored Plesiosaur, Plesiosaurus dolichodeirus, of the Enaliosaur 



division of Mesozoic Reptiles 266 



167. A Mosasaur, Tylosaurus dyspelor, of the Enaliosaur division of 



Mesozoic Reptiles 267 



168. The hugest of all known Dinosaurs, a Sauropod, Diplodociis . . . 268 



169. A Stegosaur, an armored Dinosaur 269 



170. A Triceratops, Triceratops prorsus, of the Dinosaur division of 



Mesozoic Reptiles 269 



171. Theropods, Allosaurus agilis, of the Dinosaur division of Mesozoic 



Reptiles 270 



172. A small two-legged Dinosaur, Podokesaurus holyokensis from the 



Triassic of Massachusetts 271 



173. An Ornithopod, Claosaurus annectens, of the Dinosaur division of 



Mesozoic Reptiles 272 



174. A Rhamphorhynchus of the Pterosaur division of Mesozoic 



Reptiles 272 



175. Map showing the surface distribution (areas of outcrops) of Lower 



Tertiary (Eocene and Oligocene) strata in North America. 283 



176. Map showing the surface distribution (area of outcrops) of Upper 



Tertiary (Miocene and Pliocene) strata in North America . . . 285 



177. Eocene sandstone resting by sharp contact upon Upper Cretaceous 



white chalk in Alabama 2S6 



178. Eocene-Oligocene strata as seen in the Wind River Basin of 



Wyoming 288 



179. Soft white diatomaceous Miocene shale in southern California. 290 



180. Paleogeographic map of North America during Lower Tertiary 



(Eocene-Oligocene) time 293 



181. Paleogeographic map of North America during Miocene time . . 295 



182. "Toadstool Park " : a view in the Bad Lands of western Nebraska. 266 



