﻿Problems in Quebec Geology. 483 



Grenville division. There are also undoubted conglo- 

 merates and slaty beds and the clastic nature of many of 

 the rocks is easily seen. There is also seen a large 

 development of hornblendic and granitic rocks, the former 

 being rarely found in the Grenville series north of 

 the Ottav^^a, while in the character of certain of the 

 gneisses and crystalline limestones there is a marked 

 resemblance. It would appear, therefore, that these 

 rocks of the Hastings series are not easily separable from 

 those of the Grenville series. They appear on strati- 

 graphical grounds to represent an upper portion of the 

 Grenville series, though for purposes of discussion the two 

 series may be considered as one and the same, in so far at 

 least as our investigations in this direction have extended. 

 As for their position in the geological scale, it may be 

 said that they rest upon the Fundamental Gneiss as a 

 distinct clastic series, but whether they should be styled 

 an upper division of tlie Laurentian or the lowest member 

 of the Huronian is not of much moment, so long as their 

 relations to the underlying rocks and to each other 

 are clearly established. In character, lithologically, they 

 are very like the schists and limestones, which in New 

 Brunswick and the eastern townships of Quebec have 

 been styled pre-Cambrian and probably Huronian. 



On the east side of the St. Lawrence, throughout the 

 area extending from the Vermont boundary on the south, 

 to the city of Quebec, and thence eastward along the 

 south side of the St. Lawrence to the extremity of the 

 Gaspe peninsula, a peculiar development of slates, lime- 

 stones, sandstones and conglomerates extends, distinct 

 in character from most of the horizontal formations 

 found in the more immediate vicinity of the St. Lawrence 

 basin, where the characteristic strata of the Cambro- 

 Silurian system have a wide development and an extended 

 range from the Potsdam sandstone to the summit of the 

 Hudson Eiver or Lorraine formation. In the eastern 



