CAMBRIAN GEOLOGY AND PALEONTOLOGY 



No. 5.— CAMBRIAN SECTIONS OF THE CORDILLERAN 



AREA 



By CHARLES D. WALCOTT 



(With Ten Plates) 



Contents 



Pag« 



Introduction 167 



Correlation of sections 168 



House Range section, Utah I73 



Waucoba Springs section, California 185 



Barrel Spring section, Nevada 188 



Blacksmith Fork section, Utah 190 



Dearborn River section, Montana 200 



Mount Bosworth section, British Columbia 204 



Bibliography 218 



Index 221 



Illustrations 



Plate 13. Map of central portion of House Range, Utah 172-173 



Plate 14. West face of House Range south of Marjum Pass 173 



Plate 15. Northeast face of House Range south of Marjum Pass; ridge 

 east and southeast of Wheeler Amphitheater, House 



Range 178-179 



Plate 16. North side of Dome Canyon, House Range 182 



Plate 17. West face of House Range, belovi: Tatow Knob 184 



Plate 18. Cleavage of quartzitic sandstones, Deep Spring Valley, Cali- 

 fornia 186 



Plate 19. Sherbrooke Ridge on Mount Bosworth, British Columbia 207 



Plate 20. Ridge north of Castle Mountain, Alberta; profile of southeast 



front of Castle Mountain 209 



Plate 21. Mount Stephen, British Columbia 210 



Plate 22. Profile of mountains surrounding Lake Louise, Alberta 216 



INTRODUCTION 



My first study of a great section of Paleozoic rocks of the western 

 side of North America was that of the Grand Canyon of the Colo- 

 rado River, Arizona. In this section the Cambrian strata extend 

 down to the horizon of the central portion of the Middle Cambrian 

 (Acadian) where the Cambrian rests unconformably on the pre- 

 Cambrian formations.^ 



* See American Jour. Sci., 3d ser., xxvi, 1883, pp. 437-442. 



167 



