CAMBRIAN GEOLOGY AND PALEONTOLOGY 



V 



No. 4.— PRE-DEVONIAN SEDIMENTATION IN SOUTHERN 

 CANADIAN ROCKY MOUNTAINS' 



By CHARLES D. WALCOTT 



(With Plate 25) 



CONTENTS 



PAG(£ 



Introduction 148 



Cordilleran Geosyncline 14c) 



Proterozoic Deposits in the Cordilleran Geosyncline 150 



Troughs of Paleozoic Time 152 



Bow Trough ■ 158 



Extent of Bow Trough 162 



Longitudinal undulation 163 



Goodsir Trough 163 



Beaverfoot" Trough 165 



Sawback Trough 167 



Glacier Lake Trough 169 



Robson Trough 172 



ILLUSTRATIONS 



PLATE Plate 



25. Map of areas of subsidiary troughs frontispiece 



KiouRE 'r'^^'^ Figures page 



14. Outlines of subsidiary troughs I53 



15. Sketch showing extent of maximum deposition of sediments I55 



16. Stratigraphic sections of the Bow, Goodsir, and Beaverfoot Trough. . . 156 



17. Geological section crossing Vermilion and Palliser Ranges 15S 



18. Geological section along the Bow-Kicking Horse Rivers IS^^ 



19. Geological section of Ptarmigan Peak and Fossil Mountain 159 



20. G:ological section of Fossil Mountain, to Sawback Range 160 



21. Diagrammatic section of formations deposited in Beaverfoot Trough.. 166 



22. Geological sections of the Sawback Trough 168 



23. Section of formations deposited in the Sawback Trough i/O 



' Publishe'd posthumously. Dr. Walcott completed the manuscript only ten 

 days before his death on February 9, 1927. The proofs have been corrected 

 by Dr. Charles E. Resser. 



Smithsonian Miscellaneous Collections, Vol. 75, No. 4 



147 



