Vlll BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Page 



: Illustrations of natural rock bridges 335 



Illustrations of natural rock bridges 336 



Comparison of one of the Yakutat Bay earthquakes of 1899 



with the California earthquakes of 1906 375 



Tokio seismograms of Alaskan earthquakes 376 



Map and sections of Birds Hill, Moose Nose, Oak Hum- 

 mock, near Winnipeg, Manitoba 407 



American Falls 447 



Portions of Niagara Falls 448 



Portions of Niagara Falls 448 



: Mounds made by ants and termites 449 



Blackwelder: Exposure of quartzite pebbles and Cambrian quartz- 



ite 523 



Geologic exposures on the eastern and western slopes 



of the Wasatch range 534 



Willard overthrust, Ogden Canyon, Utah 536 



Views of Ogden Peak and Ogden Canyon, and the 



Wasatch range, Utah 537 



Exposures of carboniferous limestone, Ogden Can- 

 yon, Utah 538 



Beach cusps 599 



Beach cusps 615 



-Types of sand grains 657 



Types of sand grains 658 



Types of sand grains 659 



Types of sand grains 660 



Types of sand grains 661 



Veta Park, Colorado, and the north rock stream 675 



The north rock stream 675 



The north rock stream 675 



The north rock stream 676 



The north rock stream 676 



N : Local anticlines in chagrin shales at Cleveland, Ohio. . . 771 

 Anticline in chagrin shale 772 



Figures 

 Day: 



Figure 1 — Diagram showing temperatures of melting and solidification 



in a eutectic series 152 



2 — Melting curves of the feldspars 157 



3 — An electric furnace of usual type with crucible and thermo- 

 element in position 158 



4 — Small crucible for the accurate determination of the melting 



point of minerals { nearly full size) 159 



5 — Meltmg curves of orthoclase 160 



6— Diagram showing change in composition during melting in 



an isomorphous series 167 



" 7 — Diagram showing the relation between calcium metasilicate 

 and magnesium metasilicate when mixed in any propor- 

 tion at any temperature 172 



Taylor : 



Figure 1 — The world on Mercator's projection 182 



" 2— Eurasia 187 



Plate 27- 



-Cleland 





28 



u 





29- 

 30 



-Martin : 



u 





31- 



-Upham : 





32- 



-Spencer : 





33 



ii 





34 



" 





35- 



-Brannkr 





36- 



-Blackwe 





37 



38 

 39 



40 



t < 



it 





41- 



-Johnson : 





42 



a 





43- 



-Sherzer- 





44 



cc 





45 



u 





46 



47 







48- 



-Patton : 





49 



n 





50 



n 





51 



u 





52 



ii 





53- 



-Van Hor 





54 



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