STRATIGRAPHY ALONG THE ROCKY MOUNTAIN TRENCH 365 



Syntrophia nundina 

 Raphistoma nasoni 

 Arthrorachis sp. ind. 

 Hystricurus tuberculatus 



Symphysurus cleorus 

 S. elongatus 

 Menocephalus sp. ind. 



According to Raymond this is a typical Ceratopyge fauna, com- 

 parable to that at the base of the Ordovician in Europe. It has 

 been found in several other localities in the west directly overlying 

 the Upper Cambrian, and Dr. Raymond thinks that it implies the 

 absence of the Ozarkian series from the west. 



Upper Ordovician and Silurian. — Comparing the section made 

 by Allen^ along the main line of the Canadian Pacific with that of 

 the trench, there are seen to be some resemblances but several 

 important differences. 



SECTION ALONG THE CANADIAN PACIFIC 



(After Allen) 



'J. A. Allen, Can. Geol. Siirv. Guidebook No. 8, Part 2, p. 120. 



