398 



at rest, at least so far as concerns the copper region of the lake 

 country. 



Dr. Jackson said, in so wide an area as the south shore of 

 Lake Superior, hundreds of miles in extent, it is probable that 

 there may be sandstones of a lower series, and he was not disposed 

 to include the Pictured Rocks in the same formation with those of 

 Keweenaw Point and Isle Royale ; but thus far no paleontological 

 evidence has been discovered to indicate the geological age of 

 these sandstones, and no one has ever traced out their stratigraph- 

 ical relations and order of superposition, beyond what was done 

 by Dr. Jackson and his assistants in his public surveys, the wil- 

 derness state of that region rendering the work at present imprac- 

 ticable. 



Prof. Agassiz reiterated the opinion expressed at the last meet- 

 in"-, that the sandstones of New Brunswick then referred to are 

 Triassic ; whether those of Lake Superior are of the same age he 

 was not prepared to say. He thought that in the instances cited 

 by Prof. Rogers the paleontological facts contradicted the strati- 

 graphical relations, but his experience had taught him to place 

 implicit confidence in fossils ; and from the examination of these 

 he wished to put on record his opinion that the fossil fishes of the 

 Albert coal belong to a period more recent than all the coal 

 deposits of the Old World, and that the sandstones found in con- 

 nection with it belong to the Trias and to the New Red, 



Prof Rogers could not admit the Triassic age of the sandstones 

 of the St. Croix in New Brunswick, and the neighboring region 

 of Perry in Maine. These rocks had furnished, at one locality in 

 the latter district, impressions of a plant to which he had formerly 

 called the attention of the Society as closely resembling the Cy- 

 clopteris (^Sphenopteris) HihernicuSy so characteristic of the Upper 

 Devonian rocks of Scotland and Ireland. Since then he had been 

 confirmed in his opinion as to the aflinities of the fossil by the high 

 authority of Prof. Newberry. 



As regards the New Brunswick rocks, it cannot be doubted 

 that while most of the belt extending along the northern shore of 

 the Bay of Fundy belongs to Silurian and probably Devonian 

 periods, a large area in the interior is occupied by deposits of 



