200 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 75 



tail, and Chancellor in the Goodsir Trough ; the Sherbrook, Paget, 

 Bosworth, Arctomys, Eldon, Stephen, and Cathedral in the Bow 

 Trough. 



To what extent, if any, contemporaneous deposition went on in 

 the Goodsir and Beaverfoot Troughs is unknown. At present we 

 have no evidence that any of the formations of the area assigned to 

 the Goodsir Trough are represented in the areas of the Beaverfoot 

 or Bow Troughs, so I have inserted them all at their maximum 

 thickness.* 



Near Elko, B. C, on the Crowsnest branch of the Canadian Pacific 

 Railway and 132 miles (212.4 km.) south-southwest of the Ghost 

 River section, the Devonian limestone is superjacent to the Elko 

 formation, which consists of a massive-bedded siliceous dolomite and 

 a massive gray siliceous limestone containing indistinct coral-like 

 forms.^ Beneath the Elko there is a formation with a Middle Cam- 

 brian fauna," but the exact contact of the Elko and Burton formations 

 was not seen by Schofield. In 1914 he referred the Elko (p. 81) to 

 the " Silurian Ordovician, or Cambrian " and assigns to it a thickness 

 of 90 feet (27.4 m.), but in 1922 the Elko is bracketed with the Burton 

 as Middle Cambrian." From my studies in the Canal Flat area of 

 British Columbia it seems not unlikely that the Elko limestone will be 

 found to be the equivalent of one or more of the great Upper Cam- 

 brian limestones or possibly the Middle Cambrian Eldon limestone ^ 

 of the Mount Bosworth section.* The known relations of the pre- 

 Devonian formations to the pre-Cambrian of the Selkirk and Dogtooth 

 Mountains on the western side of the Columbia River Valley from 

 Canal Flats to Golden, B. C, are described in the paper on the Beaver- 

 foot-Brisco-Stanford Range.' 



* Since this was written a restudy of the few fossils found in the formations 

 of the Ottertail Range indicates the possibiHty that the lower portion of the 

 Goodsir and hence also the underlying Ottertail and Chancellor are not younger 

 than the lower half of the Upper Cambrian. If this possibility should be 

 proved to be a fact, then these formations will have to be correlated with the 

 Bosworth and adjacent formations, or perhaps, since the contained faunas 

 are not the same, will interfinger with them. — C. E. R. 



^ Schofield, S. J., Geol. Surv. Canada, Museum Bull. No. 2, 1914, p. 83. 



^ Idem, p. 125. 



■* Geol. Surv. Canada, Museum Bull. No. 35, 1922, p. 15. 



^ Smithsonian Misc. Coll., Vol. 53, No. 5, 1908, pp. 204-209. 



° This interpretation has been considerably altered by recent discoveries of 

 new faunas by members of the Geological Survey of Canada. — C. E. R. 



' Smithsonian Misc. Coll., Vol. 75, No. i, 1924, p. 39. 



