TABLE OF CONTENTS 



Chapter XXVI — Continued. Page 



The western face of the House Range 243 



Vertical uplift or horizontal extension 244 



Ranges in the Humboldt region, western 



Nevada 245 



Chapter XXVII. Scientific relations: 1901- 



1910 247 



Decreasing relations with scientific societies. 247 



Latest work and words on Niagara 250 



The naming of Gilbert Gulf 251 



Chapter XXVIII. New fields of work in Cali- 

 fornia 253 



Studies and vacations in the Sierra Nevada, 



1903, 1904 253 



A house party in the Sierra, 1907 254 



Scientific hospitality in the Sierra, 190S 255 



Earthquakes and faults 256 



The San Francisco earthquake 257 



Gilbert's conception of an earthquake 258 



Earthquake forecasts 259 



Earthquakes in Alaska 260 



Residence and investigations at Berkeley. _ 261 



Illness of 1909-10 262 



Chapter XXIX. Reports on hydraulic-mining 



debris 265 



Transportation of detritus 265 



Preparation of first report 266 



Distribution of debris 268 



Gravels outwashed upon the valley plain.. 269 



Deposits in San Francisco Bay 270 



Quantitative physiography 271 



Chapter XXIX — Continued. Pago 



The tides of San Francisco Bay 272 



Work upon second report 273 



Chapter XXX. The last eight years 275 



Gradual recovery from illness 275 



Summers at Annisquam, 1911, 1912.. 276 



Personal incidents 277 



Last words on isostasy 279 



The geological aspects of isostasy 281 



Chapter XXXI. Leading characteristics of Gil- 

 bert's work 283 



Gilbert's era 283 



Characteristics of published work 283 



The Wheeler survey reports 284 



The Powell survey reports 285 



The national survey; Bonneville and Wash- 

 ington 286 



Liberation from Washington 287 



Work in California 287 



Gilbert's presidential addresses 288 



Gilbert's personal influence 289 



Scientific honors 291 



Chapter XXXII. Gilbert's last study 295 



Return to an old theme 295 



The Wasatch Range 296 



Structural evidence of faulting 297 



Physiographic evidence of faulting 298 



Confirmation of physiographic by struc- 

 tural evidence 299 



The Wasatch fault block 299 



Final illness and death 300 



ILLUSTRATIONS 



Page 



G. K. Gilbert, 1891. Frontispiece 



Fiq. 2. Gilbert at the age of 19 Facing 5 



3. Section at the mouth of the Colorado Canyon; from Gilbert's notebook, October 4, 1871 22 



4. Mouth of the Colorado Canyon. Photograph by W. T. Lee, United States Geological 



Survey Facing 22 



5. Ideal diagram of Confusion, House, and Fish-spring Ranges; from Gilbert's notebook, October 



29, 1872 56 



6. Ideal section of a laccolith; from Gilbert's notebook, August, 1875 75 



7. Mount Holmes, Henry Mountains; looking southeast. Photograph by H. E. Gregory, United 



States Geological Survey Facing 76 



8. Mount Jukes, Henry Mountains, looking west. Photograph by C. R. Longwell, United States 



Geological Survey Facing 76 



9. Mount Hitlers, Henry Mountains; from Gilbert's notebook, 1876 76 



10. The western face of the Morvine laccolith 80 



11. Gilbert in Colorado, 1894 • Facing 210 



12. Mount Gilbert, Chugach Mountains, Alaska. Photograph by National Geographic Society. Facing 232 



13. Western face of the House Range, Utah. Photograph by G. K. Gilbert 1 



14. Eastern slope of the House Range, looking south; Swasey Mountain in the distance. Photo-I 



graph by G. K. Gilbert >242-243 



15. Western face of the House Range, looking south. Photograph by G. K. Gilbert J 



16. Southeast part of Fish Springs Quadrangle, United States Geological Survey 242 



17. Generalized frontal section of the House Range; from Gilbert's notebook, 1901. Low-lying 



frontal blocks are omitted 242 



18. Gilbert Gulf, an arm of the ocean temporarily occupying the basin of Lake Ontario; from report 



by H. L. Fairchild 251 



