680 E. O. ULRICII REVISION OF THE PALEOZOIC SYSTEMS 



In New Brunswick and Cape Breton the early Paleozoic section is 

 essentially the same as in Sweden and ISTorway and similarly incomplete. 

 In each of these areas it seems to me that Cambrian sedimentation ceased 

 with the middle Cambrian, and the Olenus fauna, which succeeds the 

 middle Cambrian, in Scandinavia as in the maritime provinces of 

 Canada, is thought to be early Canadian in age. The hiatus between the 

 middle Cambrian on the one hand and the Bretonian and ^'Olenidian" 

 on the other, therefore, would correspond to the upper Cambrian of the 

 Mississippi and southern Appalachian valleys plus the whole of the 

 Ozarkian. 



Briefly noted, the Canadian of America, as here interpreted, seems to 

 correspond to the following European formations : In the Baltic section, 

 to the beds between the base of the Olenus slate and the top of the Cera- 

 topyge beds; in England, the corresponding interval includes the Tre- 

 madoc and Arenig, beginning with the Olenus and Dictyonema flahelJi- 

 forme zones and extending upward to the top of the Didymograptus 

 murcliisoni zone of Lapworth. In Bohemia the evidence in hand is not 

 satisfactory. Here probably only the Br da zone (D 1^) is positively 

 referable to the Canadian. The Komorau zone (D l'^) is classified by 

 Katzer as Cambrian, transitional to the Ordovician. The fauna as listed 

 contains some graptolites strongly indicative of Canadian age. Other 

 fossils, however, like Echinosphcefites ferrigena and species of Conularia 

 suggest only post-Canadian. Possibly the lower part is Canadian and 

 the upper Ordovician, or it may be another case of the survival of vigorous 

 species into, a succeeding age. 



Note. — It is understood that it is the author's intention to publish 

 additional matter on this subject. — Editor. 



