IV TABLE OF CONTENTS. 



Page. 

 Eepoet of a. 0. Peale, M. D. — Continued. 



Chapter VII. Stratigrapliy — Cenozoic formations 140 



Tertiary ,..-. 140 



Fort Union or Great Lignite group 141 



Bear River group 144 



Bitter Creek series 145 



Wasatch group 147 



Green River group 147 



Wind River group 148 



Bridger group 149 



White River group 150 



Lignitic group 152 



Tertiary between Grand and Gunnison Rivers 156 



Green River and Bridger groups 156 



Post Tertiary and recent 161 



Chapter VIII. Eruptive rocks — trachytes — trachorheites — basalt 163 



Porphyritic trachytes 163 



Trachorheites - 168 



Basaltic areas „ 171 



Chapter IX. Economical geology „ 175 



Catalogue of minerals ...*. 178 



Catalogue of rocks 179 



Report OFF. M. Endlich, S. N. D 181 



Letter to Dr. F. V. Hayden 183 



Introduction 185 



j Chapter I. Metamorphic area 187 



Chapter II. Volcanic area 193 



Chapter III. Sedimentary area i 210 



Silurian 210 



Devonian 211 



Carboniferous 214 



Cretaceous 221 



Cretaceous (No. 1) 222 



Cretaceous (No. 2) 224 



Chapter IV. Mines 229 



Occurrence of lodes 232 



Plighland Mary 233 



The Robert Bruce 234 



TheComstock lode 234 



The Yreteva 234 



Green Mountain lode 234 



The Pride of the West 234 



The Little Giant 235 



Excelsior lode , 235 



The Prospector .• 236 



The Pelican lode 236 



Big Casino 236 



Ouray 236 



Conclusion 239 



Report of Samuel Aughey, Ph. D 241 



The superficial deposits of Nebraska 243 



The Drift J 243 



The Loess deposits 245 



Fruit on the Loess deposits 249 



Scenery of the Loess deposits 250 



Origin of the Lacustrine deposits 2.50 



Length of the Loess age 253 



Life of the Loess age 254 



Alluvium , 256 



The sand-hills 259 



Alkali lands 260 



The bad lands 261 



Fuel from the surface-deposits 262 



Water-resources of Nebraska 263 



Timber in modern geological times , 265 



MoUusks in the Lacustrine deposits 266 



