THE 



GEOLOGICAL MAGAZINE. 



NEW SERIES. DECADE IV. VOL. IX. 



No. XII.— DECEMBER, 1902. 



OI2.IC3-IlNrJLXi ^^JBOTXCXjES. 



I. — The Canadian Rockies. Part I : On a Collection of Middle 

 Cambrian Fossils obtained by Edward Whymper, Esq., 

 F.R.G.S., FROM Mount Stephen, British Columbia. ^ 



By Henky Woodward, LL.D., F.R.S., F.G.S. 



(PLATE XXII.) 



{Contimied from the November Number, p. 505.) 



rPHE accompanying section (Plate XXII) will serve to show, 

 L diagrammatically (after Dr. Ami), the succession of the 

 Cambrian rocks at Mount Stephen and Mount Field, B.C., and 

 the position of the Trilobite bed on the flanks of Mount Stephen 

 (referred to on p. 503) from which Mr. Whymper's collection was 

 obtained. 



Mr. C. D. Walcott, in his paper on the Cambrian fauna of Mount 

 Stephen (Amer. Journ. Sci. [3], 1888, vol. xxxvi, pp. 161*-166), 

 writes : " Of the nine or more species found at Mount Stephen, 

 six are stratigraphically located in the Cambrian system. Two 

 species — Ogygia ?? Klotzi and Ptychoparia Cordillerce — are unknown 

 from any other locality. 



" The next fauna above the Olenoides beds of the Highland 

 section is of Upper Cambrian or Potsdam age, and contains 

 three undetermined species of Hyolitlies ; Dicellocephaliis Pepinensis, 

 D. (type of B. Minnesotensis) , DicellocepJialus sp. ; Ptychoparia 

 (Mdoma ?) dissimilis, Ptychoparia sp. ? ; Arethusina Americana ; 

 Illmiurus sp. ? Of this fauna two species are identical with those 

 from the higher Potsdam fauna at Eureka, viz. Ptychoparia {E. ?) 

 dissimilis and Arethusina'? Americana; whilst Belleroparia antiquata 

 and Dicellocephalus Pepinensis occur in the Upper Potsdam sandstone 

 of Wisconsin. The presence of the Pleurotomaria-like shells and 

 the species just mentioned correlates the fauna of Mount Stephen 

 with that of the upper horizon of the Potsdam faunas of Wisconsin 

 and Nevada. 



^ Eead befoi'e the British Association for the Advancement of Science (Section C 

 Geology), Belfast, September 11th, 1902. ' 



decade IV. VOL. IX. NO. XII. 34 



