Burling — Pur cell Range and Rocky Mountains. 255 



ually accumulated by the members of the Canadian Sur- 

 vey considerable evidence that these rocks are at least in 

 part of Upper Ordovician (I), Devonian, and Upper 

 Palaeozoic age. Palaeozoic fossils younger than the Cam- 

 brian have thus been collected near Laurie, Lardo, Ward- 

 ner, etc., but so far as the writer is aware no Cambrian 

 fossils have been found west of the fault contact which we 

 have described as occurring between the elastics of the 

 Purcell Range and the shale series trenched by the Colum- 

 bia River. This contact lies at a considerable elevation 

 above and to the west of the actual river, however, and 

 in the shaly series outcropping upon the slope between the 

 fault contact and the river are strata which have yielded 

 both Middle and Upper Cambrian fossils. 



These two Cambrian fossil horizons were discovered by 

 Ami and Daly, respectively, in the section exposed by the 

 Canadian Pacific Railway, west of Donald, in the gorge 

 by which the Columbia River leaves its trench and crosses 

 over to the west some ten or fifteen miles north of Golden. 

 The Middle Cambrian fossils found by Ami are in the 

 collections of the Canadian Geological Survey. They are 

 preserved as whole specimens and are curiously similar 

 to if not identical with the Ptyclioparia hingi occurring in 

 the Middle Cambrian Wheeler formation of the House 

 Range in Utah (Smithsonian Misc. Coll., vol. 53, No. 5) 

 even to the cone-in-cone ctructure of the matrix surround- 

 ing the fossils. The Upper Cambrian fossils found by 

 Daly are also to be found at Ottawa and include forms 

 described by Walcott as Dicellocephalus dalyi and Illae- 

 nurus elongatus (Smithsonian Misc. Coll., vol. 64, No. 13, 

 pp. 367-368). They were collected from an outcrop occu- 

 pying unknown relations to the rest of the section and are 

 correctly referred to the Upper Cambrian by Walcott. 

 But the horizon of Daly's Upper Cambrian fossils has 

 been found by the writer in place in the Goodsir forma- 

 tion which Walcott has referred to the Ordovician (Smith- 

 sonian Misc. Coll., vol. 57, No. 7, 1912, pp. 233-234, pi. 35). 

 This does not mean, however, that the reference is to be 

 changed from Upper Cambrian to Ordovician, for a large 

 part of the 6,000-foot Goodsir formation, including the 

 beds carrying the so-called "Ceratopyge fauna" of Wal- 

 cott, is of Upper Cambrian age. The Upper Cambrian 

 fossils found by Daly west of Donald are to be correlated, 

 together with the "Ceratopyge fauna," with the Orr 

 formation of the House Range section in Utah (Burling, 



