﻿252 Prof. Milne and Alex. Murray— Roqks of Newfoundland. 



[Table referred to on p. 251.] 



North America. 



Lower Laurentiaa 



Upper Laurentian 



Huronian 



St. John's Group 



Paradoxides Slates 



Lower Potsdam 



Fpper Potsdam 



Lower Calciferous '. 



Upper Calciferous 



f Levis 

 Chazy 



Trenton and Bird's Eye Limestones 



Utica Slate 



Hudson River Beds 



Oneida Conglomerate „ 



Medina Sandstone 



Clinton Group 



Niagara Group 



Onondago Group 



Lower Helderberg 



Oriskany Sandstone 



L. Devonian. Caudagalli Grit 



Scholiarrie Grit „ 



Gaspe Sandstone 



Mid. Devonian or Upper Helderberg 



U. Devonian, Portage Group, etc 



Lower Carboniferous (Gypsiferous) 



Middle Carboniferous (good coal) 



Upper Carboniferous 



Great Britain. 



> Laurentian 



Cambrian ? 



> Lingula Flags 



> Tremadoc Slates 



Llandeilo Beds 



Caradoc Beds 



L. Llandovery Eoeks 

 U. Llandovery 



"Wenloc-k. 

 L. Devonian 



M. Devonian 

 U. Devonian 



Carboniferous 



Newfoundland. 



(L. Laurentian. 

 lU. Laurentian. 

 Huronian. 



Primordial Silurian. 



Potsdam. 

 Calciferous. 



(Quebec ( Y^^^' 

 ' { Lauzon. 



\ Group j 



Sillery. 



Bird's Eye Lime- 

 [stone. 



M. Silurian. 



Clinton. 

 Niagara ? 



Devonian ? 

 Gaspe Sandstones. 



L. Carboniferous. 

 Millstone Grit. 



and hearing that the newest were Lower Carboniferous, almost 

 shuddered, and wondered how it was possible to live in such a 

 country.! 



Laurentian. — Commencing with the lowest member of the series, 

 we have a large exposure of crystalline rocks, which have been 

 identified as being of Laurentian age. This identification is based 

 on the relations they hold to the Lower Silurian rocks which they 

 underlie, and on the lithological resemblances they have to the 

 Laurentian rocks of Labrador and Canada. The limestone bands 

 which belong to the Continental exposures of this series have not 

 yet been found ; neither have any traces of organic remains.^ Both 



' I cannot see upon what grounds Prof. Judd founds this remark. The valley of 

 the Great St. Lawrence, including the magnificent champaign regions of Western 

 Canada, now called Ontario, is based upon Silurian rocks for the greater part, the 

 highest formation being of Devonian age; the beautiful valley of Stratheam, in 

 Perthshire, is upon Old Red Sandstone; the valley of the Forth, Stirlingshire, is 

 Carboniferous ; and a great part of Herefordshire, Monmouth, etc., is Lower Silurian. 

 It seems to me, that the capabilities of a country, for the support of life, depend, not 

 upon their actual position in the geological sequence ; but upon the constituents 

 of which they are composed, and the mineral character of the debris which is yielded 

 by their ruins, and spread over the surface ; and also in great measure to the degree 

 of metamorphism and disturbance by which they have been affected. — A.M. 



■■* The crystalline limestone bands of Lower Laurentian age, so well known in 

 Canada, have not been seen in place, in Newfoundland; but I have reason to think they 



