CAMBRIAN GEOLOGY AND PALEONTOLOGY 



V 



No. 5.— PRE-DE\^ONIAN PALEOZOIC FORMATIONS OF 

 THE CORDILLERAN PROVINCES OF CANADA 



By CHARLES D. WALCOTT 



(With Plates 26 to 108) 



CONTENTS 



PAGE 



Preface iii 



Part I 



Introduction 185 



Geographic nornenclature 188 



Cotton Grass and Tilted Mountain Cirques 188 



Robson Peak District 189 



Geological nomenclature 189 



Sawback formation 190 



Devonian 192 



Description of plate 26 195 



Distances in direct line between typical sections referred to in this paper. . . 196 



Cordilleran Geosyncline 197 



Pre-Devonian unconformity and interval in the Cordilleran Provinces 198 



Folding of pre-Devonian sedimentary formations of the Cordilleran Geosyn- 

 cline of the Canadian Rocky Mountains 201 



Character of the rocks 203 



Part II 



Pre-Devonian Paleozoic formations 207 



Devonian 208 



Mount Wilson quartzite 208 



Ghost River formation 210 



Silurian 211 



Brisco formation 213 



Beaverfoot formation 215 



Wonah quartzite 217 



Ordovician 217 



Skoki formation 217 



Robson formation 218 



Smithsonian Miscellaneous Collections, Vol. 75, No. 5 (End of Volume) 



175 



