28 



PARALLELISM OF THE QUEBEC GROUP. 



Diagram Shewing the supposed Parallelism of the English 

 and Canadian Lower Silurian formations. 



Lower 

 Landoveey. 



Bala or 

 Oaradoo. 



Upper 

 Llandeilo. 



Lower 

 Llandeilo, 

 Tremadoc 



Slate. 



Lingula 

 Flags. 



X X X X X X 



XXX XX XX 



X X X X XX 



1 1 



1 1 1 



1 I 



1 1 1 



1 1 



1 1 1 



i 1 



1 1 1 



1 1 



1 1 ! 



1 1 ] 1 



1 1 1 1 1 





-' 1 1 1 1 



1 1 1 1 



II 1 1 1 



II 1 1 



] 1 1 1 



III 1 





- 



1 



z 



canadian. 

 Base of Antioosti Group. 



Hudson River. 



Utica Slate. 



Trenton. 

 Black River. 



Chazt ? ^ HE Q UEBKC Group must 

 Calcifeeous. ^ occupy this P° sition ™? 



nearly. 



The Potsdam Sandstone is supposed to 

 be situated about here, but we have no 

 facts to determine its parallelism posi- 

 tively. It is most probably of the age 

 of the Lower Quartz Rock of Scotland. 



Below the Lingula Flags in England are situated the Cam- 

 brian (Sedgwick), beneath which the Laurentian (Logan) occurs 

 in the North of Scotland. 



In Canada, we have below the Potsdam, the Huronian (Logan), 

 and beneath that, the Laurentian. 



In England the Potsdam formation has not I believe been clear- 

 ly identified ; but in Scotland, Sir R. I. Murchison has shewn in 

 several papers, published in the Journal of the Geological Society, 

 that it is represented by the Lower Quartz Rock of Sutherlandshire. 

 It is there overlaid by the Durness limestone, which has been iden- 

 tified by him and by Mr. Salter as of the age of the Calciferous 

 formation. I have seen the fossils collected by them, and think 

 that their opinion is undoubtedly correct. In Canada, the Que- 



