COMPARISON WITH THE CARBONIFEROUS OF EUROPE. 



149 



Cyclopteris Acadica, Daws., of the Lower Coal measures of North 

 America, also is very nearly allied to the Cyclopteris tenuifulia, 

 Gopp., in the German culm. 



M The predominance of the Sigillaria and Stigmaria in the Middle 

 Coal formation, proves the identity of this zone with our European 

 zone of Sigillaria; and the analogy with the flora of the principal 

 heds of coal of England and Ireland is particulary striking, especially 

 through the great extension of the Alethopteris lonchitica, which is 

 never wanting there. 



" When, finally, Dawson sets forth in a prominent manner, that in 

 the uppermost division of Sir W. Logan's section of the South 

 Joggins, which corresponds with the upper part of the Upper Coal 

 formation, trunks of conifers and Calamites, Cal. Suckovii, etc., and C. 

 approximates, by the side of Aspidiaria, etc., are the fossils most 

 frequently to be met with, we are enabled to place this zone nearly 

 on a level with the zone of Calamites, or the third band of vegetation 

 in Germany. 



" Thus the succession in the flora of the Coal formation, as we 

 have ascertained it for Europe, appears to have been established for 

 America also by Dr Dawson's profound investigations, and they will 

 probably soon be followed by the discovery of the existence of the 

 two upper zones, — the i Anmdaria' and 'Fern' zones." 



It will be observed that Professor Geinitz anticipates the separation 

 of two additional zones in the Upper Coal formation. Of these I 

 have as yet no distinct evidence, and the paucity of fossils in these 

 Upper rocks may render it difficult to make such distinctions. Un- 

 doubtedly, however, Annularia galioides, Cordaites simplex, and 

 several ferns, as Pecopteris arborescens and Alethopteris nervosa, are 

 characteristic of some of the newest beds known to me in the coal- 

 field of Pictou. 



