2 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 75 



PAGE 



Upper Cambrian 39 



Lyell ? 39 



Middle and Lower Cambrian 39 



Summary - 40 



Note on the extension of the pre-Devonian formations of the Beaverfoot- 



Brisco-Stanford Range north of Kicking Horse Canyon 40 



Ordovician-Silurian Boundary 41 



Disconformity at the base of the Silurian Beaverfoot formation 43 



Variation in thickness of formations 44 



Pre-Pleistocene formations of the floor of the Columbia River Valley 



(" Rocky Mountain Trench ") from Canal Flats to Golden 45 



New Formation Names 47 



Brisco formation 47 



Beaverfoot (redefined) 48 



Sabine formation 49 



Wonah Quartzite ^9 



Sinclair formation 50 



Messines formation 50 



Pipestone formation 51 



ILLUSTRATIONS 

 Plates 



FACING 

 PLATE PAGE 



1. Outline map of portion of Rocky Mountain area in British Columbia. . 8 



2, fig. I. Beaverfoot formation at Gates of the Canyon 10 



2, fig. 2. Gates of the Canyon, Sinclair Canyon 10 



3, Outcrop of Red Wall Fault Breccia 10 



4, fig. I. Southwest face of Sinclair Mountain 10 



4, fig. 2. Boulders in Red Wall Fault Breccia 10 



5. Gates of the Canyon fault 10 



6. Fault in Mons, Sinclair Canyon 11 



7, fig. I. Looking up Stoddart Canyon from the west 20 



7, fig. 2. Southwest end of Sabine Mountain 20 



8. Western face of Stanford Range 21 



Text Figures 

 figure page 



1. Allan section of northern part of Beaverfoot Range 4 



2. Diagram of Sinclair Canyon Section. 10 



3. Silurian graptolites 12 



4. Diagram of profile of southwest face of Sabine Mountain 26 



5. Outline of west fact of Grainger Mountain 29 



6. Osarkispira Ico Walcott, n. sp 38 



7. Hungaia billingsi Walcott, n. sp 38 



8. Symphysurina woosteri Ulrich, n. sp 38 



9. Briscoia sinclaircnsis Walcott, n. sp 38 



10. Plicated shales and limestones of Mons formation in Canyon Creek 



Canyon 46 



11. Same as figure 10, a little lower down the creek 46 



